Remove commented code

The source code is bloated by old source code still in the source files. These parts should be removed, as they are not up-to-date with the current development and distract from the real code.

Important: It is not meant, to remove describing comments, as Doxygen or code explanations!

Stats from current master:

Language	files	blank	comment	code
C++	61	5337	11649	29155
C/C++ Header	61	1220	1464	5121
Sum:	122	6557	13113	34276