Eliminate support for partial reads.  The Linux kernel will never
return partial results, so this buffering was unnecessary.

Fixes breakage by commit 1a619522

Don't fail to start if mpd.conf does not exist; just use default
values.

Let the user know that MPD has failed.  Not the best thing to do, but
better than pretending it still runs.

Invoke "ant" when a Java source is modified.

Missing piece from commit e0ca4347

For database plugins that don't use the UpdateService.

They are only used inside dsdiff_read_metadata_extra().