Blender Internal: Fix material preview that the bounce lights permanently disappear once volume material is used.
Fix T37624: Rename Marker does not update Marker in 3D View until Frame Change

Was simply missing notifier listener in 3D viewport.

Also fixes missing refresh when adding a marker.
Fix own regression in rB254aa8f3a0fb: Titles and sub-titles in menus were drawn shifted to the right.

Reported by plasmasolution over IRC, thanks.

Also fixes wrong handling of "sub-titles" with icons in EnumO menus (they were just treated as text-only ones).

Dev notes: in fact, that clean up commit revealed kind of an "hidden bug that happend to work well"
(or at least, a very bad hack): with titles without icon, code used to use uiItemL with ICON_NONE.
However, as the root layout is a menu one, internal ui code would add a dummy blank icon,
and set UI_HAS_ICON flag for the label button. But in the affected menus, code afterward assigned
UI_TEXT_LEFT to but->flag, thus erasing the (internal) UI_HAS_ICON. As UI_TEXT_LEFT was moved to
but->drawflag, the internal flag was no more erased, and the fake icon was drawn, creating that
shift-to-the-right effect. Turns out we do not even have to set UI_TEXT_LEFT in these cases,
just add label buttons without icon is enough!
Math library: minor additions sqrtf_signed and copy_v2_fl2
Screw Modifier: copy face data when the original face is known.

also de-duplicate code for handling the closing face strip.
Screw Modifier: UV support

- When existing faces are available use their UV values
- When no faces are connected to an edge - generate UV's

Also add option to stretch U/V to bounds.
Fix T37627: create scene with copy settings did not copy cycles settings.
Fix T37541: multires not reading external displacement file after entering edit mode.
Fix T37632: Wrong tooltip for "Motion Blur" on mask node
Fix T37303, Fix T37163: cycles mask layers that are also excluded not rendering
correct with multiple render layers.

This case is somewhat weak, we now do a few more checks on sync than I would
like, but it's not too bad.
Fix mistake in last commit with submodules.
Fix T37633: duplicate value GPUDynamicType could cause GLSL render issues.
Fix T36976: drag and drop tooltip not working with retina and drawing off
screen near top of the window.

The code here was not updated for retina / DPI changes yet. The tooltip also
could draw off screen when dragging to a button at the top of the window, now
it places the tooltip lower in such cases.

Offscreen drawing fix is based on patch by Antony Riakiotakis.
Fix T37583: regression in bmesh triangulate breaking python's use of face_map
Fix T37636: double added pyattr_get_lights
Fix T37121: decimate works badly with flat surfaces
Fix for recent error (editmesh triangulate crashed).
BMesh Operators: BMO_op_finish now overwrites values in debug mode

This should prevent accidental use-after-free.
Fix for recent BMesh regression refactoring out face tessellation