Use standard C++ types

[gervandiepen]

All Casacore specific types such as Int, uInt, Bool, etc. should be replaced by their C++ counterparts int32_t, uint32_t, bool, etc.
The typedefs defining them can be removed from aipstype.h and aipsxtype.h. However, it means they cannot be used in packages such as CASA anymore. Maybe it is better to have an #ifndef NO_CASACORE_TYPES around them.