Remove some deprecated functions

[mscuthbert]

having exact equivalents

runningUnderIPython -> runningInNotebook
common.lcm -> math.lcm
Scale.next -> Scale.nextPitch()

Removed older forms of converter functions that had a capital letter inconsistency

registerSubconverter -> registerSubConverter
unregisterSubconverter -> registerSubConverter
subconvertersList -> subConvertersList
defaultSubconverters -> defaultSubConverters
getSubconverterFormats -> getSubConverterFormats
setSubconverterFromFormat -> setSubConverterFromFormat

Remove MIDI routines not needed since Python 3 became required (and bytes and strings were distinguished)

midi.charToBinary(ch) -> bin(ord(ch)) 
midi.getNumbersAsList(bytes) -> list(bytes) 
midi.intsToHexBytes([ints...]) -> bytes([ints]) 

More complex to replace, but were not used enough to have two ways of doing the same thing.

• duration.unitSpec -> (d.quarterLength, d.type, d.dots, None, None, None) unless tuplets then replace last three with (tup[0].numberNotesActual, tup[0].numberNotesNormal, tup[0].durationNormal.type)
• obj.isClassOrSubclass(classLists) -> not obj.classSet.isdisjoint(classLists)

[coveralls]

coverage: 93.067% (+0.02%) from 93.051%
when pulling 9836429 on deprecations-gone2
into 47adf5a on master.