add basic gui part for terrain interaction
update heightAt()
allow changing of osg terrain with Alt+Mouse Scroll at camera center

this changes only the geometry, not the physx height field
remove data files, moving to elemateData
Merge remote-tracking branch 'origin/master' into terrainInteraction_22
Merge remote-tracking branch 'origin/master' into terrainInteraction_22
fix height navigation height update on terrain modification #22
fix min/max terrain height #22
change physx heightfield, too #22
set some more points #22
terrain update now fast, making members public to modify objects directly #22

that's quite ugly, but fast. OsgTerrain was not made for this kind of usage...
Merge branch 'hand_of_god' into terrainInteraction_22

Conflicts:
	src/game.cpp
	src/godmanipulator.cpp
	src/godmanipulator.h
	src/godnavigation.cpp
manipulate at hand position #22
Merge branch 'master' into terrainInteraction_22
Merge remote-tracking branch 'origin/hand_of_god' into terrainInteraction_22

Conflicts:
	src/godmanipulator.cpp
	src/godmanipulator.h
add terrain grab and pull interaction #22
Merge remote-tracking branch 'origin/master' into terrainInteraction_22

Conflicts:
	src/godmanipulator.cpp
Merge pull request #37 from lanice/terrainInteraction_22

Terrain interaction 22