BRANCH 4.1-21:
   added the background color for weekend in title area of gantt_element_wdg
   adjusted the background color of weekend divider bars
BRANCH 4.1-21:
  added search_expr option to SObjectCalendarWdg to specify the initial search as opposed to using search_type and filters
Merge branch '4.2' of https://github.com/Southpaw-TACTIC/TACTIC into 4.2