BRANCH 4.1:
   added init_load_num as a settable option for ViewPanelWdg and TableLayoutWdg
   raised a SetupException in ViewPanelWdg if an empty search_type is passed in
BRANCH 4.1:
  if index is set to true for a custom url and and index is not found, it resorts to drawing the regular admin page
  replaced & with &amp; in HashPanelWdg
BRANCH 4.1:
  caught the error properly in ExpressionElementWdg on the get_display level to avoid error during calculation of the bottom widget
  made the @SUM operation not throw and error when a column does not exist
Merge branch '4.1' of https://github.com/Southpaw-TACTIC/TACTIC into 4.1