fixed Issue 90:  	 Backplot inch http://code.google.com/p/heekscnc/issues/detail?id=90
fixed Issue 90:  	 Backplot inch
http://code.google.com/p/heekscnc/issues/detail?id=90
danheeks/heekscnc,danheeks/heekscnc,danheeks/heekscnc,danheeks/heekscnc