Added Module load command and deleted old code

A new Module load command \LoadIfModuleExists will hopefully result in
cleaner class code for now (though will be moot when documentation
starts).  Also, legacy code for Nomenclature and Committee Listing
commands were removed.
Fixed Nomenclature env and added simple Hashes

The broken Nomenclature environment now works fine (Subnomenclature NOT
tested) but is WITHOUT TEST.  Also, a simple Hash (associative array)
system is implemented.