[RFC PATCH 0/3] Support for importing in builtin-fetch

This series is an attempt to standardize importers and exporters for 
non-git upstream repositories, and to allow the normal git programs to use 
them transparently when configured to do so. So far, it only includes 
fetch/import, but the implementation there is sufficient to get "git 
fetch" to import data from a foreign system, set the configured remotes/ 
refs, and produce a working FETCH_HEAD (so "git pull" also works).

Part 4/3 is yet another p4 importer, which is mostly interesting as an 
example (although it does do a passable job of supporting integrates, 
which I haven't seen in another client-side p4 importer).

	-Daniel
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