Starting to add quad strip drawing for orthognonal culled slice viewing
Fixed memory leak.  Each of the toolbar modes (view, foci, borders, volume) may provide a widget that is added to the toolbar.  The widget only had a parent when it was displayed in the toolbar.  Those toolbar mode widgets not displayed in the toolbar were never deleted resulting in leaked memory and a potential to cause a crash.  The code has been updated to fix this problem.
Added methods for conversion of 8-bit integer signed and unsigned, vector and arrays to a string
Added ability to draw volume slices using both quad indices, and quad strip indices.
Added ability to draw volume slices using both quad indices, and quad strip indices.
Default improved (faster) orthogonal volume slice drawing on.  There are two algorithms for drawing volume slices.  The first method (original) draws each voxel as a quad, independent of all other voxels.  This first method is more efficient when a 'small' number of voxel in the slice (e.g.: label volume) are drawn.  The second method (new) submits all vertices (coord/normal/rgba) to OpenGL and then draws the voxels using the vertex indices of the quads.  The second method is more efficient when most voxels in the slice are drawn (e.g.: anatomical volume).  Now, when a volume slice is about to be drawn, an estimate of the number of bytes submitted to OpenGL is computed for both methods and the method that requires the least number of bytes is used.  Timings show a twenty to forty percent reduction in volume slice drawing.
Removed print statement mistakenly left in UserInputModeAbstract destructor.
Changed logging level of message displayed in scene loading from INFO to FINE.
Until now, for each EventTypeEnum, we have created a corresponding subclass of the class Event.  However, if the event has no event specific information, there is really no need to create a subclass of the class Event.  So, a method has been added to EventManager named sendSimpleEvent(const EventTypeEnum::Enum) that is available for sending these types of events.  EventManager::sendSimpleEvent() does contain a switch statement on every EventTypeEnum so that the method can only be used on specific EventTypeEnum's.
On the Preference Dialog Misc page is an item that is used to enable or disable display of the 'Develop' menu.  This functionality has been modified so that changing the status for the display of the 'Develop' menu takes effect immediately.  Previously, it did not take effect until a new window was opened.