New buildfarm client release

There is a new release of the PostgreSQL buildfarm client available at
<https://github.com/downloads/PGBuildFarm/client-code/build-farm-4_7.tgz>

Most of the changes in the release are minor bug fixes. Enhancements
include:

* extra_config can now have a DEFAULT key, and these entries are
prepended to any branch-specific entry. This means you can now set
common extra config in one place instead of having to specify them
for each branch. The sample entry now uses this as its key instead
of HEAD, and the sample entry has a line for "fsync = off", which
can improve the speed of buildfarm runs.
* provide for include as well as exclude filters on file names for
deciding if a run is needed. The old config setting of
trigger_filter is still honored as if it were trigger_exclude, the
new name.
* allow skipping install steps as well as other steps.

Enjoy!

cheers

andrew