[Scons-dev] Another PR - improve running things from source

[anatoly techtonik]

https://bitbucket.org/scons/scons/pull-request/111/several-fixes-for-running-sconspy-from/diff

This one fixes lookup logic for scons.py script to find imported SCons
code, making source files from which it is run a top priority.
Previously it would use system-installed SCons.
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anatoly t.