Optimizing streamToTimespanCollection.
better subconverter; tinyN: 2-el parse gone.

The converter.parse(‘string’, ‘timeSignature’) form of calling
TinyNotation is gone — it was a relic and needed to disappear for
future expansions.
simplify SpannerBundle obscure usages.
Deprecating WholeNote, HalfNote etc.

Removed all references from .py files
romanText translate -- 10x improvement
multiprocess results -- no errors
Some smaller speed increases on translate
all tests pass.
NEW: mei/__init__.py to Start MEI Development
WIP-MEI: patch converter.Converter.parseData() to detect MEI vs MusicXML