Merge remote-tracking branch 'origin/fix_wrong_vtk_and_vistrails'

* origin/fix_wrong_vtk_and_vistrails:
  Fixed wrong vars used
  Fix add new module operation
  Fix initial workflow size
  Reduces glow and thickens connection lines
Remove layer from table if reading file fails
Merge branch '129-fix-layer-table-on-error' into next
Fixed various minor bugs
Merge remote-tracking branch 'origin/fix_ui_bugs' into next

* origin/fix_ui_bugs:
  Fixed various minor bugs