Started working on a tkinter wrapper to cut down on code clutter.  After
looking into the work involved and comparing to wxpython I've decided to
move to wxpython for the GUI.  I'm committing this in case wx doesn't work
out and I need to revert to tkinter.  Thankfully only PHdisplay.py will need
to be rewritten, the database layer shouldn't need to be changed.  Since the
logic is so entangled with the tkinter code that too will need to be redone,
which would probably happen anyway to take advantage of wx's different set
of capabilities.
Just a little spring cleaning for the tkinter --> wxpython GUI migration.
All tkinter code has been deleted and there's now a blank slate for wxpython.
This is the fallback point if the wx interface ever needs to be completely
rewritten.
Initial code for the wxpython GUI added.  Tabs and menus still empty.
Looks like wxpython is going to work well.