Make the Hall C modifications of the detector map a standard feature.

No longer require conditional compilation with HALLC_MODS flag.
Make THaCutList::EvalBlock(TList*) static and add better error checking.

Removes a long-standing binary-compatibility workaround.
Remove various trivial binary-compatibility workarounds.

THaDetectorBase::fNelem needs to stay an Int_t because it may be used
as an array size counter by ROOT's RTTI, which requires Int_t.