clip board should check separately whether to clip holes

git-svn-id: http://fritzing.googlecode.com/svn/trunk@6822 85f94c43-f63a-0410-9d22-21439860c375
clip board should check separately whether to clip holes

git-svn-id: http://fritzing.googlecode.com/svn/trunk@6823 85f94c43-f63a-0410-9d22-21439860c375