Justine Devin / gammalib

Only the protected interface has been affected by the review. Now all FITS arguments are passed by reference.

All registry classes are now based on the GRegistry interface. The ostream and GLog friend functions have been removed from the classes as they are now implement on the GRegistry level.

The source code was checked to comply to the actual coding standards.

The Doxygen documentation of the source code was improved.

Add an optional message to the rsp_invalid_type exception.