#2 Properly sort the date column

[Ka-Hing Cheung]

I've found a problem with syndigator's date sorting,
what it currently
does is compare the string, which is of course
problematic. The ideal solution is probably to store
the date in the GtkTreeStore, but it's late now and I
don't want to dig too deep into it, so I simply
specified a sort_func for the date column.
The patch is generated against cvs, but I am having
some problem to even run it (probably because I didn't
make install), so please test.

[Ka-Hing Cheung]

v1

[Bruno Tavares]

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Approved and applied to cvs