PATCH: Countdown to 20121030

[Colin Campbell]

For 20:00 MDT Tuesday October 30

Enhancement:
   
    Issue 2445: Center a number above a measure - R 6730044
    Issue 2928: Patch: parser.yy: get rid of SCORE_IDENTIFIER token - R 6780049
    Issue 2929: Patch: Allow \tweak to act as a stand-in for \once\override - R 6768064
    Issue 2930: Patch: Allow \tag to accept multiple tags, like \keepWithTag and \removeWithTag do - R 6778054
    Issue 2931: Patch: Allow quoted identifiers like to be used like \"violin1", not just defined - R 6778055
    Issue 2932: Patch: Change \alterBroken interface to match that of other tweak/overrides - R 6784063

Cheers,
Colin
-- I've learned that you shouldn't go through life with a catcher's mitt on both hands. You need to be able to throw something back. -Maya Angelou, poet (1928- )