[FIX]Avoid attempting to use  jquery_tablesorter in mobile mode, since Tiki doesn't seem to be fully ready to use it in mobile mode, as seen in admin users (no user table was shown), and when tablesorter was forced to be loaded, some small dropdowns were not easy to port mobile. Safer approach: disable  jquery_tablesorter in mobile, and ensure that buttons in the actions column when managing users are big enough for human fingers on mobile devices. Thanks jonnyb for tips on how/where to fix.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49711 b456876b-0849-0410-b77d-98878d47e9d5
[ENH]Show RealName instead of login name in the corresponding wiki argument variables related to "Author" if the Real Name exists and the preference to display real names where possible is enabled. Thanks diggy, almost the same code you suggested as a patch. Ref: https://dev.tiki.org/wish5112 . Will be backported to 12.x after 12.1 is released.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49713 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] PHP notice

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49716 b456876b-0849-0410-b77d-98878d47e9d5