New attempt on tuplets/percent repeats

[Erik Sandberg]

Hi,

Here's a patch that massively refactors tuplets and percent repeats.

Highlights:
- tuplets are now signalled by start/stop events.
- each percent/slash is signalled by an individual event, whose
repeat-count property tells whether it should be numbered (this moves
some decisions from engraver to iterator)

The diffs of some files are huge, so I'm sending the new files instead.

I think it's a bit out of place to merge percent_repeat and
double_percent_repeat into one engraver. Some next steps that would be
nice are:
- move handling of double percent repeats to slash_engraver (or
possibly to a new double_percent_engraver, but imho they are similar
enough to share engraver)
- handle percent_repeat with start/stop event
- create different event types for percent event, slash event and
double percent event.

These are however not very related to music streams.

Erik

percent-repeat-engraver.cc
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percent-repeat-iterator.cc
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slash-repeat-engraver.cc
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tuplet-engraver.cc
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repeats.diff
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