Converter: fix label text for path. It is used for projects, packages and units.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41798 4005530d-fff6-0310-9dd1-cebe43e6787f
Converter: Make sure the same unit will not be added again after AddUnitImmediately.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41799 4005530d-fff6-0310-9dd1-cebe43e6787f