part db update

git-svn-id: http://fritzing.googlecode.com/svn/trunk@6996 85f94c43-f63a-0410-9d22-21439860c375
gnd bus had nodemembers which did not exist

git-svn-id: http://fritzing.googlecode.com/svn/trunk@6997 85f94c43-f63a-0410-9d22-21439860c375