<feature>Workspace window is always visible</feature>
<feature>Workspace window is always visible</feature>

Add the workspace window to the upper-left corner and split the other
left-side widgets on the lower-left.

gui/vistrails_window.py:
  - QVistrailsWindow.UPPER_LEFT_DOCK_AREA: new constant
  - QVistrailsWindow.LOWER_LEFT_DOCK_AREA: new constant
  - QVistrailsWindow.RIGHT_DOCK_AREA: new constant
  - QVistrailsWindow.UTILITY_WINDOW_AREA: new constant
  - QVistrailsWindow.DOCK_AREA_MAP: new map to qt dock constants
  - QVistrailsWindow.init_palettes: use new dock area constants and
    update logic to do splits automatically for the left side

VisTrails/VisTrails,Nikea/VisTrails,celiafish/VisTrails,minesense/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,celiafish/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,celiafish/VisTrails,Nikea/VisTrails,minesense/VisTrails,minesense/VisTrails,hjanime/VisTrails,minesense/VisTrails,hjanime/VisTrails,Nikea/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,Nikea/VisTrails,minesense/VisTrails