Updated Form#equals() and #hashCode()
Updated ChoiceField#equals(Object) & #hashCode()
Updated some dependency versions

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>
Bugfix in Column
Lots of improvements and bugfixes on ProjectStore (+ all back-ends) & RecordsStore (+ all back-ends).

One remaining problem: re-inserts of records with known autoIncrementing key on SQLRecordStore not being rejected. Will fix tomorrow.

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>