Fixed combined xyz move bug (thanks zpl). Reversed default direction of
X motor. Added support for M569 command. Fixed bug in execution of M503
command via web interface.
Changed compiler optimization option to -O2 (was accidentally reset to
-Os in previous release)
Set the number of decimal places reported in the responses to various M
commands
Integrated zpl's changes to returning lists of files, returning info for
file being printed, and some network layer changes