Do not hide home commands after usage

Home command are hidden after usage so if launch X home, Y home is
hidden, also seem available even hidden as can be launched if nothing
looks selected - this is confusing and not convenient - remove hidden
filter to always show commands.
Add Power Saving function

In Quick Setting menu have a new setting for power saving
(off/1min/5min/15min/30min) this will set power off LCD back light and
light after defined time (default is 30 min), light will be back if
keypad is pressed - it also follow light on/off setting.
Typo errors found by Aaryn
Change Z travel acceleration to decrease noise

change Z travel acceleration from 100 to 150 in eeprom and repetier make
Z movement less noisy.
Avoid nozzle to hit metal plate when homing

Move Y in 7 to avoid nozzle hit metal plate after homing - Thanks Aaryn
Merge pull request #2 from drbogger/luc

Add Power Save Feature, and other bug fixes.