[RFC] Adding specialized indexes to speed up slow operations

The git internal storage model is optimized for some operations (those 
that Linus considers common in his workflow), while some other commands 
end up being rather expensive, like git-whatchanged 
/some/deep/path/file.c or git-log /someother/file/deep/in/the/tree.c

For some stuff I'm working on (cvs daemon emulation) my plan is to have 
a stupid && rebuildable set of indexes to speed up cvs-like annotates 
and per-file cvs-like changelogs. Knowing very little about efficient 
data structures, I'll probably use something uninspiring like SQLite. 
But it's one of those things that perhaps belongs in the core -- not 
cvs-like stuff, but utilities to build and maintain some specialized 
indexes.

cheers,


martin
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