Makefile.am: add variable FS_LIBS
fs/GzipOutputStream: new class wrapping zlib
db/update/InotifySource: remove FifoBuffer

Eliminate support for partial reads.  The Linux kernel will never
return partial results, so this buffering was unnecessary.
util/FifoBuffer: rename to StaticFifoBuffer
util/DynamicFifoBuffer: move code to new base class ForeignFifoBuffer
util/ForeignFifoBuffer: add method GetAvailable()
input/TextInputStream: return char*

Revert to the old API before commit e9e55b08, removing unnecessary
bloat.
util/ForeignFifoBuffer: add method MoveFrom()
util/ForeignFifoBuffer: add method Swap()
Merge branch 'master' of git://git.musicpd.org/master/mpd