Remove generation of <package>-config scripts

This version of CLHEP will not build subpackages, so remove the
generation of the -config scripts for each subpackage. Only comment
out the relevant code for now.
Remove un-needed LIB_SUFFIX checks

Remove clhep_lib_suffix function and 32/64bit helper functions. These
checks are not needed, though the ability to set LIB_SUFFIX is retained
for platforms that need it.
Simplify version variables and usage

Replace "VERSION" variable with "CLHEP_VERSION", constructed from
integers for CLHEP_VERSION_{MAJOR,MINOR,PATCH,TWEAK}.

Update usage of the VERSION variable in cmake and generated C++ code
with these variables as needed. Remove no longer required
ClhepParseVersion module.