ref #23 : integrated culling into gui, fixed bug concerning bounding boxes containing the whole view frustum, changed vec4s into vec3s in view frustum data structures because the dot product does not use the semantics of homogenous coordinates
ref #23 : delete resolved TODO comment
ref #129 change camera preset keyboard hotkeys
add camera preset for random view on objects
add camera preset for bottom left view on objects
merge camera presets
invert mouse wheel navigation
fixes #93
prepare menu items and code for navigation history
add simple navigation view history browsing, ref #135
revert commit 5b94999, avoid conflict with #130
#135 implemented view history class and moved to AbstractNavigation
ref #135 add history saving for trackball manipulator
merge new master into navigation devel branch, ref #137
merge new master into navigation history branch, ref #137
resolve merge conflicts, ref #137
Ref #23: Fix frustum return values
limit navigation history to 128 items, ref #135
clean up navigation history code, ref #135
change to 4 spaces standard