Test building GCC with -j10.
Merge branch 'master' of https://github.com/brettviren/worch
Reshuffle art examples.
Keep track of what files have been read and implement an 'includes' mechanism.
Test new includes mechanism.
Raise ValueError if an include fails.
Fix typo in filename.
Comment out some noise
Add test for export_/environment feature.
Start fleshing out the externals for art.
Rationalize how configuration and requirements get fed into the PFI.

Note, do not set empty configuration variables anymore
More externals for eventual art build.
Merge branch 'master' of https://github.com/brettviren/worch

Conflicts:
	orch/__init__.py
	orch/features.py