Add config sub-tree for ARM architecture configurations; Create sub-directory heiarchy to make
ARM configs easy to fidn in config picker; Restructure BeagleBone configs to dir structure;
Updated K9 configs to correct pin numbers; added an example machine config for the K9 (Shapeoko);
Removed obsolete K9.3D configs

See README in configs/ARM dir for notes about possible later x86 config restructure.
actually delete K9.3D files
Merge branch 'MachineKit' of git://git.mah.priv.at/emc2-dev into MachineKit