Add simpletest.py (authored in April 2104!)
Add testit.sh, get running in Python3, revise .gitignore.
Add TODO.txt.
Move files into new folders.
Add and parse external test file test_add.py.
For each line in body determine the name of its type.
Have selftest.py evaluate suitable expressions - no need now to test simpletest.py.
Create Transformer that recognizes body/expr nodes.
Add ast manipulation to TODO.txt.
Refactor Transformer into edit_body_exprs(fn, tree).
Add diagnostic output to ease development.
Filter ast.Compare for change.
Start replace compare with log._compare.
Seem to be done with log_compare.
Now linking up to stub Log file.  Good.
Add future thoughts to TODO.txt.
*** empty log message ***
Add to TODO.txt.
Try (and fail) to use ast.parse( ..., mode='eval').
Add script.py, implementing Script class.