Tif directory from config.py, and some code cleanup

config.py - added 2 constatnts:
'VERSION' - current version of program
'TIF_DIRECTORY' - path to directory with tiff files generated from
trueflow

renpyable.py
- minor cleanup code
- added information about author
- added current version of program
- program now will use TIF_DIRECTORY constant from config.py to
determine where the TIF files are