New field "network" in item table to speed up the system.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
BBCode: When converting to HTML for the connectors, then videos are now converted in a regular link (there were problems with some vanishing video links)
Several performance improvements.
Removed many "limit 1" at update and delete queries since they were superflous und generated massiv logfile entries
All subqueries in tag searches are now reformed. Further SQL improvements
Bugfix: There were speed problems with inifinite scroll on firefox
Merge pull request #803 from annando/master

SQL performance and reduction of database warnings