[IMP-dev] Interface changes to the IMP.em module

As previously discussed, I just made some interface changes to the IMP.em module, to remove unnecessary prefixes or suffixes:

IMP::em::EMFitRestraint is now IMP::em::FitRestraint IMP::em::ImageEM is now IMP::em::Image IMP::em::VolumeEM is now IMP::em::Volume

Note that Dina intends to make similar changes to the SAXS module in the near future.

Some other minor changes which do not affect the Python interface, but do affect the C++ headers: - Fixed spelling (convertors.h -> converters.h) - Renamed headers (headers that do not define classes should be given names separated by underscores, not CamelCase; EMnoise.h -> noise.h, EMproject.h -> project.h, HeaderConverters.h -> header_converters.h)

Ben