Remove operator= and operators[] as they are not supported by SWIG.
Update Doxygen configuration file to remove obsolete parameters.
Correct file for Doxygen documentation.

The file was corrected so that no more warnings occur during Doxygen documentation generation.
Ignore also backed up Doxygen configuration file.
Add seed() access method.

Add method to access a random number generators seed value.
Correct header file inclusion.

Include GCOMResponse.hpp instead of GCTAResponse.hpp.
Correct header file inclusion.

Include GCOMInstDir.hpp instead of GCTAInstDir.hpp.
implemented mc() method for GModelSpectralLogParabola
Fixed a mc()-bug and added correct reading of fermi-style xml-files
Do some minor code reformatting to apply to coding standards.