pg_xlogdump

Here's an updated version of pg_xlogdump. This is rebased on top of the
committed xlogreader, palloc restructuring and libpgcommon, PG_RMGR
stuff, and is basically a revamped version of what Andres submitted in
http://www.postgresql.org/message-id/1357672187-7693-5-git-send-email-andres@2ndquadrant.com

I also attach a patch to move the relpathbackend() function to
src/common. On top of that, it's trivial to change pg_xlogdump and
remove the "uninplemented" stub we're currently using. (I also tried it
with a real implementation of relpath() that was mostly a duplicate of
the backend's relpath(), but I didn't like the duplication at all even
though I stripped the unnecessary bits).

(The more adventorous might think about moving timestamp_to_str to
src/common, as well, but this isn't a simple task: it depends on some
backend global state variables such as GUC vars, so it requires detailed
surgery. I think it's a worthy goal nonetheless, because it'd allow us
to reduce useless duplication in ECPG, but it's not a 9.3 project)

--
Álvaro Herrera http://www.2ndQuadrant.com/
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