picolisp: implemented first test (run until input="q")
extract: renamed *.py to *.txt for compatability with testris.py
removed hand-coded test files
extractor: added docstrings, and refactored to create an intermediate TestDescription object.
testris.py: expanded the docstring to explain the first step.
testris: extract find_learntris() and only show __doc__ if no path specified
learntris: rewrote test runner to do bulk i/o. Also added timeouts and show diffs for output mismatch.