Merge pull request #15 from dalerank/master

Get changes from dalerank
Implement click&drag system from gregoire. but with road not work.
Merge branch 'dalerank'
try to make aqueducts like roads
small improvements (to plazas)
Merge branch 'master' of https://github.com/gecube/opencaesar3 into vs2008-added
Changes from gathanase are added. Construction the road, houses, removal of objects working also when lmb pressed.