This patch includes
- Allow the overview report to be the default report
- Fixed sorting of modified/visited columns for page activity report
- Fixed sorting for username in useractivity report
- Fixed total rows count for user activity
- Fixed collaboration report for institutions
- Fixed issues with the new columns in the groups report

Change-Id: I2269bb5610d238bc9786d04d4c2a9122c0a4ccfc
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>