[ardour-dev] layer patch

[nick mainsbridge]

this patch is really just a quick hack to demonstrate a layering
approach to editing.
whenever a region is moved or trimmed, the other regions on its'
playlist are 'shuffled' so that the later regions are higher. this makes
manipulating regions easier esp. wrt trimming.

there are probably lots of bugs, and it's probably done badly, but it
works enough to get a feel for the concept.

-- 
nick mainsbridge <beatroot at optushome.com.au>
Beat-Route Media
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