[IMP-dev] Minor changes

the version info headers now don't have the redundant module name prefix: IMP/core/internal/core_version_info.h -> IMP/core/internal/version_info.h Same for the class defined inside.

There is now one big swig macro to wrap the constructor (IMP_OWN_CONSTRUCTOR) instead of different macros depending on the number of arguments.

Everything in SVN has been fixed.