FIX: powerlines can join properly when slope tools are used

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7265 8aca7d54-2c30-db11-9de9-000461428c89
FIX: permissions required for powerline removal and potential crash in powerline tunnel removal

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7266 8aca7d54-2c30-db11-9de9-000461428c89
FIX: crash when using way remover tool on powerline bridges

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7267 8aca7d54-2c30-db11-9de9-000461428c89