update testdata download location (nsx -> openhkl), and improve error messages
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As user www on scg3, rename ~www/www/download/testdata/nsx to openhkl. -
Adapt download instructions in sources. -
Improve error messages when downloading fails.
Currently, if the download location is made inaccessible, tests fail with messages like
HDF5-DIAG: Error detected in HDF5 (1.10.6) thread 140432145672000:
#000: ../../../src/H5F.c line 509 in H5Fopen(): unable to open file
major: File accessibilty
minor: Unable to open file
#001: ../../../src/H5Fint.c line 1652 in H5F_open(): unable to read superblock
major: File accessibilty
minor: Read failed
#002: ../../../src/H5Fsuper.c line 420 in H5F__super_read(): file signature not found
major: File accessibilty
minor: Not an HDF5 file
Instead, the error message should say something like "Cannot download from ".
Edited by Trageser