[MERGE] add hook to inspect and modify url for fallback location of a branch

[Michael Hudson]

[Now with better subject!]

Hi,

After the discussion in the "[rfc] more control over activating fallback
repositories (aka what gets stacked on)" thread, it seemed that adding a
hook to inspect and interfere with the fallback location a branch
activates was the best option.  This merge directive does that.

Cheers,
mwh
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