delete plus, connector update recursion fix

git-svn-id: http://fritzing.googlecode.com/svn/trunk@6998 85f94c43-f63a-0410-9d22-21439860c375
former delete plus => delete
former delete => delete minus


git-svn-id: http://fritzing.googlecode.com/svn/trunk@6999 85f94c43-f63a-0410-9d22-21439860c375