AliEveTrackCounter, AliEveTrackCounterEditor
--------------------------------------------
Moved class TEveTrackCounter from ROOT to EveBase as it is ALICE
specific.
AliEveEventManager
------------------
Derive also from TQObject, emit NewEventLoaded signal.
AliEveEventManagerEditor
------------------------
Add new GUI class AliEveEventManagerWindow that provides event
naviagation in a horizontally shaped main window.
visscan_init.C
--------------
Embed AliEveEventManagerWindow in the bottom section of the ROOT
browser.