add icons for units (angstrom, nm)

GUI/gui.qrc

@@ -67,6 +67,8 @@
         <file>images/1D_OK.png</file>
         <file>images/2D_OK.png</file>
         <file>images/warning_16x16.png</file>
+        <file>images/unit_nm.svg</file>
+        <file>images/unit_angstrom.svg</file>
         <file>styles/Native.stylesheet</file>
         <file>styles/Base.stylesheet</file>
         <file>styles/Dark.stylesheet</file>

GUI/images/unit_angstrom.svg

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+   sodipodi:docname="unit_angstrom.svg"
+   id="svg4"
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+   height="24"
+   width="24"
+   version="1.1"
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+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
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+        <dc:type
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+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
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+       id="path2"
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+    <path
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+       sodipodi:nodetypes="csssssssc" />
+    <path
+       style="fill:#838686;fill-opacity:1;stroke-width:0.0689405"
+       id="path2-5"
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+       sodipodi:nodetypes="csssssssc" />
+    <path
+       style="fill:#838686;fill-opacity:1;stroke-width:0.0689405"
+       id="path2-5-6"
+       d="M 5.9953181,8.8086125 H 4.1912947 c -0.124542,0 -0.270691,-0.0046 -0.267351,0.04197 l 0.04185,0.58345 c 0.0033,0.04656 0.100961,0.04903 0.225503,0.04903 h 1.8040234 c 0.124541,0 0.183654,0.0028 0.183654,-0.04373 v -0.581686 c 0,-0.04656 -0.05911,-0.04903 -0.183654,-0.04903"
+       sodipodi:nodetypes="csssssssc" />
+    <path
+       style="fill:#838686;fill-opacity:1;stroke-width:0.0689405"
+       id="path2-5-5"
+       d="M 6.0371665,13.894711 H 4.2331431 c -0.124542,0 -0.270691,-0.0046 -0.267351,0.04197 l 0.04185,0.583451 c 0.0033,0.04656 0.100961,0.04903 0.225503,0.04903 h 1.8040234 c 0.124541,0 0.183654,0.0028 0.183654,-0.04373 v -0.581694 c 0,-0.04656 -0.05911,-0.04903 -0.183654,-0.04903"
+       sodipodi:nodetypes="csssssssc" />
+    <path
+       style="fill:#838686;fill-opacity:1;stroke-width:0.0689405"
+       id="path2-5-66"
+       d="M 5.9743941,16.481405 H 4.1703707 c -0.124542,0 -0.270691,-0.0046 -0.267351,0.04197 l 0.04185,0.58345 c 0.0033,0.04656 0.100961,0.04903 0.225503,0.04903 h 1.8040234 c 0.124541,0 0.183654,0.0028 0.183654,-0.04373 v -0.581686 c 0,-0.04656 -0.05911,-0.04902 -0.183654,-0.04902"
+       sodipodi:nodetypes="csssssssc" />
+  </g>
+  <text
+     xml:space="preserve"
+     style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:10.6667px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#000000;fill-opacity:1;stroke:none"
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+     id="text1686"><tspan
+       sodipodi:role="line"
+       id="tspan1684"
+       x="7.323452"
+       y="12.721884">Å</tspan></text>
+</svg>

GUI/images/unit_nm.svg

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   inkscape:version="1.1 (c68e22c387, 2021-05-23)"
+   sodipodi:docname="unit_nm.svg"
+   id="svg4"
+   viewBox="0 0 24 24"
+   height="24"
+   width="24"
+   version="1.1"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
+  <metadata
+     id="metadata10">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs8" />
+  <sodipodi:namedview
+     inkscape:current-layer="svg4"
+     inkscape:window-maximized="0"
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+     inkscape:pageopacity="0"
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+     gridtolerance="10"
+     objecttolerance="10"
+     borderopacity="1"
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+     pagecolor="#ffffff"
+     inkscape:pagecheckerboard="0" />
+  <g
+     id="g25714"
+     transform="rotate(-90,11.950788,12.329164)">
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+       style="fill:#838686;fill-opacity:1;stroke-width:0.196516"
+       id="path2"
+       d="M 3.9822142,4.1255449 H 3.3643168 c -0.042657,0 -0.092715,-0.1089236 -0.091571,0.9956408 l 0.014333,13.8413253 c 0.00114,1.104564 0.03458,1.163034 0.077237,1.163034 h 0.6178974 c 0.042657,0 0.062904,0.06708 0.062904,-1.037489 V 5.2885789 c 0,-1.1045695 -0.020247,-1.163034 -0.062904,-1.163034"
+       sodipodi:nodetypes="csssssssc" />
+    <path
+       style="fill:#838686;fill-opacity:1;stroke-width:0.110498"
+       id="path2-9"
+       d="M 8.2962914,4.1342801 H 4.3102157 c -0.275181,0 -0.5981043,-0.00534 -0.5907253,0.048796 l 0.092465,0.678357 c 0.00738,0.054134 0.2230785,0.057 0.4982594,0.057 h 3.9860757 c 0.2751801,0 0.4057931,0.00329 0.4057931,-0.050847 v -0.676306 c 0,-0.054134 -0.1306064,-0.057 -0.4057931,-0.057"
+       sodipodi:nodetypes="csssssssc" />
+    <path
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+       id="path2-9-9"
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+    <path
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+       sodipodi:nodetypes="csssssssc" />
+    <path
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+       id="path2-5-6"
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+       id="path2-5-5"
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+    <path
+       style="fill:#838686;fill-opacity:1;stroke-width:0.0689405"
+       id="path2-5-66"
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+  </g>
+  <text
+     xml:space="preserve"
+     style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:10.6667px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#000000;fill-opacity:1;stroke:none"
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+     id="text1686"><tspan
+       sodipodi:role="line"
+       id="tspan1684"
+       x="2.4690492"
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+</svg>