Steven checked in some changes yesterday which fixed a great number of

Steven checked in some changes yesterday which fixed a great number of
failing tests by setting SCONSFLAGS='-warn=no-python-version' in def
run() in TestSCons.py yesterday, where previously it was done in def
__init__(...).

This fixed most of the broken tests, but broke some of the working tests.
I readded the logic to def __init__

In addition I've added an extra arg to the __init__ for TestSCons.py
ignore_python_version (which defaults to true).
For those tests which need to be able to see the deprecation and/or
test the functionality of the deprecation.

git-svn-id: http://scons.tigris.org/svn/scons/trunk@4361 fdb21ef1-2011-0410-befe-b5e4ea1792b1