ui/input_async.c: fix synchronization scheme.
drivers/fet_proto.c: deal with spurious 0xff fr...
prog/load: fix argument parsing (treat quotes c...
Added MSP430F5255 device description to fet_db
Use pkg-config on OS/X when Fink is available.
util/gpio: add Windows stubs.
Version 0.23
Makefile: rework for TDM-GCC compatibility.