add servo_direct_arm.scad.  move log.
first unworking version of floorbot
servo_direct_arm.scad: update nut hole placement
holder.scad, bevel_gear.scad: update sizes.
.gitignore: ignore some NXT and emacs related files.
coax_center.scad: move nubs to their own module.
Makefile: make more generic for Floorbot
Floorbot: move preset shape data to auxilliary class
cad coax: longer legs on base
coax_center: improve weak spot at leg connection point.  lengthen legs.
Floorbot: fix math; query max motor speeds.
Floorbot: add manual homing procedure before drawing starts.
add ideas.org
Floorbot: re-add penUp() and penDown(), adjust bot size.
svg2data.pl: adjust for new Floorbot size and orientation