[schema/optimization] Wrap rql expressions into EXISTS node when checking individual permissions Some RQL expression may retrieve several results. It makes sense to wrap them into an EXISTS node to optimized things a bit. This is already done by security insertion of 'read' rql expressions.

[views/optimization] Prefetch state'names and comment format in wfhistory component This will avoid later queries to retrieve them.

[devtools] Make timeout error in qunit tests configurable and use SkipTest in test_jscript.py The reason is that the latter tests quite often fail in our CI environment, possibly due to concurrent execution of the browser, and this makes it hard to identify a truly failing build there. So skip tests with a timeout error.