M PyShell.py
M ScriptBinding.py

1. Update ScriptBinding.py to highlight a syntax error in the Edit window,
   and place the cursor on the error.  Add a syntax check to the
   Run Script event instead of waiting until the script tries to run and
   raises a syntax error in the shell, forcing the user to navigate back
   to the Edit window to fix it.
2. Modify tag_config's appropriately in PyShell.py and ColorDelegator.py
3. Some minor clean-up in ScriptBinding.py