Add a bin/time-scons.py script to manage invocation of runtest.py to collect SCons timings.
Add a bin/time-scons.py script to manage invocation of runtest.py to
collect SCons timings.

The script will build SCons and time the pre-compiled *.pyc files,
and also provides options for timing a range of revisions directly
from SVN.


git-svn-id: 7892167f69f80ee5d3024affce49f20c74bcb41d@4548 fdb21ef1-2011-0410-befe-b5e4ea1792b1

azverkan/scons,azverkan/scons,azverkan/scons,azverkan/scons,azverkan/scons