Eliminate the std::string overhead.

This was broken by commit 84d20d9e, which deleted the "!" from the
check.

Revert to the old API before commit e9e55b08, removing unnecessary
bloat.

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.