Skip existing broken tests for a clean baseline

python -m unittest discover tests
Support for 5010 270/271
Ignore repeating composites and elements (new in 5010) for now
Add generated 270 and 271 5010 parsers
Update 271 facade
Revert change to repeating element parsing.
Ignore all .pyc files.
Revert wrapper special-casing.
Whitespace.
Revert sorting.
Handle repeats.
speling
Cleanup.
Cleanup.
Add ignoreExtra argument.
Set codes property.
Add 5010 835 parser.
Support YYMMDD dates.
Add generic header parser and facade with ISA loop.
Add generic GS header parser and facade.