Adds NG911_Frontend.py

The NG911_Frontend.py file is a tkinter interface for the toolset. It is
not yet complete, but it is currently usable to set the target GDB and
then write feature class mappings to it.
Merge remote-tracking branch 'origin/dt_branch04' into dt_branch04

Conflicts:
	NG911_DataCheck.py

Commit to add NG911_Frontend.py and merge changes in NG911_DataCheck.py