[MERGE] the -Devil is in the details

[Robert Collins]

More precisely, we want to eliminate whole classes of calls from bzr,
things like full tree iterators, all-history grabbing methods etc.

So this patch lets them be easily marked as bad using '''
if evil in debug.debug_options:
    mutter_callsite(1, "Foo-bar was called with %s %s", arg1, arg2)
'''

Which will log:
Foo-bar was called with arg1 arg2
Call trace:
... a python stack here...

-Rob

-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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