New Scrollbars for Rotations

* Like the Google Picasa Program, the scrollbar stays in the center.
* When drug, the rotations for that dim. continuously increment.
* Rotation increments are prop. to scroll's distance from the center.
* You can increment rotations 1 deg. at a time with the scroll arrows.
* On screen rotations still sync with UI rotations.
* 45 degree lock works with this new feature as expected.
Rotate reset fix
re-organizing vpropview panel (not done yet)
added vpropview icon buttons, reorganized. not done.
new vpropview layout aligned and working.
Clipping sliders are now dynamically sized with the window.
fixed a mac compile error
Merge branch 'master' of github.com:brigb123/fluorender
fixes for mac UI
More Mac UI Adjustments. Added Icons to AdjustView Panel.
Added link/unlink icons to AdjustView Panel
Merge branch 'master' into yong_experimental