fix StaffDetails print-object

long-established error
quarterLength is quarterLengthRational
opFrac -- highly optimized Fractional interface.
python3 passes tests...
fix bugs in m21p conversion from fractions
updates to installation docs.
remove test that rebuilds core corpus
add runTime to multiprocessTest
test new multiprocessTest
fixed bug in harmony.key
updated License
changed anonymous lists to named tuples in omr
fix lilytranslate for svg
note.lyric._setTextAndSyllabic, no longer private
byte error analysis/phrasing; add Lyric.rawText()
fix small bug in abcFormat/__init__.py

5.0 -> 5
print statements replaced by function calls

replaced print statements in various demos with print function calls for
python 3 compatibility
Merge pull request #64 from senritsu/master

print statements replaced by function calls
some changes to layout.py
stupid py2 coding breaking py3 on stream