New files are colorized by default, and colorizing is removed when
   saving as non-Python files. Patch 1196895 Jeff Shute
   Closes Python Bugs 775012 and 800432, partial fix IDLEfork 763524

2. Update help.txt for left/right word delete

M CREDITS.txt
M ColorDelegator.py
M EditorWindow.py
M NEWS.txt
M help.txt