PITR Phase 1 - partial backport to 7.3.4, 7.3.5

Hi,

I tried to backport Simon Riggs patches for 7.4.x series to 7.3.x
with addition of python implementation of pg_arch.

It can be of interest if you consider to continue using 7.3 series of postgresql.

src/backend/access/transam/xlog.c:  calls to "ereport" was replaced with call to "elog".
src/backend/utils/misc/guc.c :      format of "wal_archive" was converted to 7.3 style
src/bin/Makefile: was removed

Attached patch can be applied to 7.3.4 and 7.3.5

During this week I'll test it in our development enviroment.

Best regards

--
  Igor Poteryaev