Removed time from investigation results table. Refs #7637.

- Updated `formatDateTime` to format datetime with desired format to allow investigation and data file datetimes to be formatted differently.
Updated help url. Refs #7637.
Improved column display in both tables. Refs #7637.
Improved various expanding issues. Refs #7637.
Open login dialog box is invalid users. Refs #7637.
Merge branch 'feature/7637_improve_icat_gui' into develop. Refs #7637.

Conflicts:
	Code/Mantid/Framework/ICat/src/ICat4/ICat4Catalog.cpp

Note: Removed datetime temp fix from dev.