Revised console commands, discovered bugs...

There are still bugs in the way the start and end
markers work.
Bug fix: restarted performance now correct

The lastReportedMPosition is now reset at the
start of each performance, not just in
sequence.init().
Still working on other known bugs...
Bug fix: Non-assisted performances now okay.

Known Bug: assisted performances still buggy.
Bug fix: mono1 now working better. Known bugs.

Bug 1: Clytemnestra's notes are set to repeat in the
score. This is wrong (the score needs changing),
but the notes should move on anyway when the
cursor moves on. This needs debugging for both
assisted and non-assisted performances.
Bug 2: Debug an assisted performance of Study 2,
staff 2 alone. This contains an irregular sequence
of chords and rests -- not just alternating chords
and rests as in Song Six.
Implementation of chord looping in Sequence.js

Non-assisted performances of both Study 2 and
Song Six have been tested, also with stopping,
pausing, restarting with and without new start and
end markers etc.
Looping has been prepared, but is off by default
in Sequence.js. It should be possible to turn it on
during live performances using the
sequence.setLooping(bool) function -- for
example when waiting for a noteOn or noteOff.
This has not yet been attempted...