Fixing garbage collection problem, and adding exception to give better error message.
Merge pull request #381 from spekary/bugfix-dbBackedFormState

Fixing garbage collection problem with DbBackedFormState, and adding exception to give better error message.
Fixes the annoyingly small error dialog.

The popup that displays an qcubed ajax error is annoyingly small. Setting the popup to have a width of auto fixes this.
Merge remote-tracking branch 'refs/remotes/qcubed/master' into alpha-3.0
Merge remote-tracking branch 'refs/remotes/qcubed/alpha-3.0' into alpha-3.0