[svk-devel] checkout signature caching

[Chia-Liang Kao]

So our current checkout mtime/size etc cache (to avoid doing full md5
check to see if a file is modified) was done with some weird
optimisation - to use one perlop.   I don't think it's particularly
efficient format though.  I made a little change on the flight to use
some format with pack and unpack.  I have not done any benchmark yet,
but it does feel slightly faster.  If anyone is up for doing some
tests, here's the patch.

Cheers,
CL
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