Issue 1707 in lilypond: add python -tt to build system

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Build Priority-Medium Maintainability

New issue 1707 by percival.music.ca: add python -tt to build system
http://code.google.com/p/lilypond/issues/detail?id=1707

We now have a policy of not accepting python files with tabs for  
indentation, and all old files have been adjusted to match.

We should add "python -tt" to the build system to avoid such errors in the  
future.  (when creating .py files in out/scripts/ and/or out/python/ )