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[CHANGE] widget margins used to be around 5-10 pixel wide as they were not set. This shrinks them to 1px which seems to be reasonable on OSX at least.
If this does not work on other platforms, please introduce platform-specific layout choices.

[FIX] - omiting the minimum size can lead to problems in several OSG manipulators. Exact reason not known.

[FIX #108] reduced some minimum sizes of several widgets. Maybe this fixes the maximize problem in unity.

[CHANGE] - cleaned up the mess with different viewers, engines and stuff for mac, for win for linux, for win with msvc ...

[CHANGE] - changed dir structure. Kernel, Common, DH and GE are now core. Gui is separat as well as ext.