TEveManager

===========

Keep projections in an array and reuse them when changing
projection-types. This allows parameters set by users to be kept for
each projection type separately (only center is controlled by manager).


TEveProjections
===============

Introduce pre-scaling of projected objects: users can specify
different scaling factors for regions of projected coordinate space.
Fish-eye distortion is applied afterwards.

Demonstrated by the new tutorial 'projection_test_prescale.C'.


git-svn-id: http://root.cern.ch/svn/root/trunk@24314 27541ba8-7e3a-0410-8455-c3a389f83636