new drill format

git-svn-id: http://fritzing.googlecode.com/svn/trunk@6819 85f94c43-f63a-0410-9d22-21439860c375
crash bug with zero-length trace

git-svn-id: http://fritzing.googlecode.com/svn/trunk@6820 85f94c43-f63a-0410-9d22-21439860c375