Recent strbuf/builtin-commit-tree/wt-status patch series

Hi,

I forgot -n to format-patch, sorry.  The ordering I have here is

        [PATCH] Add test case for basic commit functionality.
        [PATCH] Enable wt-status output to a given FILE pointer.
        [PATCH] Add strbuf_printf() to do formatted printing to a
        strbuf.
        [PATCH] Make builtin-commit-tree use a strbuf instead of
        hand-rolled realloc buffer.
        [PATCH] Split out the actual commit creation from the option
        parsing etc.
        
and finally 

        [PATCH] Split out the actual commit creation from the option
        parsing etc.
        
It fell out of the series when I reordered some patches, so I sent it
separately.

This series is some infrastructure changes and the test case I've been using for my work on builtin-commit. They are all immediately committable, and constitute most of the changes to git required by builtin-commit.

cheers, Kristian