Numerous changes

New ReactionEditor replaces ReactionInterface with species arranged
up/down instead of left/right. Word wrap in reaction text area. Loads
fast due to lazy instantiation for population of combo boxes, except for
biomass reactions (there is just no fast way to load 60 combo boxes with
2000 items).
Reaction CSV files are able to be loaded with no metabolites file
FileList - when an OPT file is clicked, FBA Menu item is disabled.
For loading and editing reactions - add metabolite prompt No button does
not add metabolite and reaction updated accordingly.
Load SQLite checks for reaction equation errors when loading.
Exit added to Model menu. When exiting if changes made, message box
appears save changes - Yes/No/Cancel, but Yes button does nothing but
close as of yet. Red "X" on top right does not have this functionality
as of yet.