These are just the doc strings I created as I was spelunking
through to see how Sugar manages launching applications. The
resulting auto-documentation is neither polished or finished,
but it should help people reading the code somewhat.
There are a few minor code cleanups:
* activityhandle (replacing C idiom for initialisation with
a Python one)
* bundle registry (using a parameterised directory name so
that it shows up in the documentation)
* validate_activity_id function, use isinstance( item, (str,unicode))
for the query, rather than two separate checks with isinstance
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