allow tabs to be cycled when focus is in editor
fix for infinite loop on bad changeset
Merge pull request #2080 from ether/ignore-ctrl-pageup

allow tabs to be cycled when focus is in editor
Merge pull request #2089 from dmitryuv/changesetslib-fixes

fix for infinite loop on bad changeset
Sometimes, the author2session / group2session don't exist anymore, but the session does.
It should be possible to delete a session, if they don't exist
Merge pull request #2108 from goldquest/dev_deleteSessionBug

Session deletion error, when group2session/author2session are not available