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.

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.

make cifti replace structure not discard unused labels by default, require code to specify cropped, as the code default was opposite the command line default

Removed obsolete enumerated type VolumeSliceViewModeEnum and removed commented out code in which it was used.  Moved VolumeSliceProjectionTypeEnum from Brain to Files so that the volume editing code can use it.

When writing the SceneInfo (that has the image), add CDATA tags for the scene name and comment.  Matt reported that placing an '&' in the scene name caused a parse error and correctly suggested using CDATA.

Changed oblique drawing to resume using CUBIC interpolation now that set modified status issue has been fixed.  The set modified status also resets the splines used for cubic interpolation so that voxels are now colored after they are edited in a oblique view.

On new volume file dialog, default the dimensions, spacing, and origin to those used in anatomical volumes.

For both border drawing and volume editing, the mouse can be dragged with the SHIFT and CTRL keys down to continuously draw points.

Enable only on/off voxel editing when a volume is viewed in an oblique mode.  Use new spin box that allows only odd values for voxel editing brush size.

Fixed a bug that did not set the name of a volume file correctly after reading the volume file.  Likely introduced as part of volume editing updates.

make VolumeBase::setModified virtual again so that it calls VolumeFile's implementation to let it know the splines are invalid

Add a preliminary version of voxel editing for oblique viewing.  Fixed issue that did not select correct volume for editing when the top layer was disabled and contained a volume file.

also reduce manual memory allocation

For the palette mapping editor, problems were noticed when the threshold mode was set to unlimited.  The range of values was set using the range of floating point numbers which caused problems with NaN sometimes being displayed and the sliders were not functioning.  Now, when the threshold is 'unlimited', the maximum absolute value for all date within the file is found.  For 'unlimited' the range is now (-2 * file-abs-max-value, 2 * file-abs-max-value)

Updates for WB-393 Volume ROI Drawing: (1) Can now drag mouse to turn voxels on and off; (2) If a new volume is created, it becomes the top-most overlay; (3) New Volume Dialog can get volume parameters (dimensions, origin, spacing) from a CIFTI file.

In an attempt to resolve WB-474, Capture Image loses overlay in resulting capture: Added a call to repaint() immediately before calling captureImage() to ensure the frame buffer is updated.

More updates for volume editing including improved error messages and clean up of comments and code.