Merged in zpl's latest changes to Network and Print Monitor modules,
providing DHCP and Netbios name support
Added command M999 S4321 to unlock flash memory, reset and boot to BOSSA
port
Z dive height is now relative to Z probe trigger height and default is
reduced to 3mm
Added experimental support for acoustic probe for delta printers
Bug fix: firmware once again prevents Z homing before X and Y are homed,
if the Z probe is used for Z homing
Various code tidying
Merged zpl's changes for binary file uploading and PrintMonitor
Fixed bug with filament-based print time estimation
Fixed bug that caused feed rate to often not be restored after running
a macro
Print Z probe offsets at end of G32 sequence if Move debug is enabled
