[Issue 1105] Add Parameter "format" to scroll list cells to define how a date cell will format its displayed date

Defaults to use RFC1123 to maintain expected behavior
[Issue 1105] Fix Last Login row in groups not sorting properly

Updated llgroupmgr.cpp's formatDateString() from upstream
 -Corrected it to actually use ISO 8601 format.

Also fixes notices tab to use the new format parameter to sort properly.
Run trim on input start locations, in case copy paste brought some spaces along for the ride