Fix data.MIDINAMES

[rettinghaus]

This resolves the problematic altIdent in data.MIDINAMES and fixes a wrong value in this range, as Bag pipe should become "Bag_pipe" instead of "Bagpipe".

This is also a bugfix for MEI 4.
closes #812

[ahankinson]

Is there a reason it's now starting at 1, not 0?

MIDI program changes are 0-indexed, so this should probably be reflected in MEI.

See: https://www.recordingblogs.com/wiki/midi-program-change-message

[rettinghaus]

This reflects the MIDI Program Change given in the original specifications. Otherwise we need to change the given Keys for percussions accordingly.

The remarks state:

MEI uses 0-based program numbers.

If that leads to confusion we should drop this, because the description in data.MIDIVALUE should be clear in this regard.

[ahankinson]

About this particular change: The original says Program #0, while the proposed change says MIDI Program Change #1. I think both are correct -- it's the first program change in the list, but "Acoustic Grand Piano" is program 0. (message value 0x00).

Given that we're specifically trying to fix an issue with it rendering to RNG correctly, and not actually trying to change the MIDI semantics, I would suggest keeping the original wording and not introducing this change here.

[musicEnfanthen]

@rettinghaus thanks for the PR, and thanks for the approval @ahankinson. Will take this PR to the next ODD meeting.

[musicEnfanthen]

Thanks a lot. Looks good.

[bwbohl]

thanks!