Fixed warning when compiled with MSVC2010.

warning C4250: 'Qtilities::CoreGui::TreeNode' : inherits 'Qtilities::Core::Observer::Qtilities::Core::Observer::objectBase' via dominance
qtilities\include\qtilitiescore\../../src/Core/source/Observer.h(510) : see declaration of 'Qtilities::Core::Observer::objectBase'
Fixed: Project MESSAGE: Warning: unknown QT: printsupport
Random documentation updates.