GroupsAndEntriesPage finished

The page file for showing, editing and creating password groups and entries is almost finished and feature complete compared to what the N9 version is able to do. That is:
- Create password groups and entries
- Editing of groups and entries
- Deleting of groups and entries
- All manipulation is directly saved to the Keepass database file
Renamed PageHeaderExtended

The extended PageHeader can show two lines of text. This is particular usefull sometimes and looks no too bad ;)
Info Popup created

The info popup is used to show any error messages to the user like wrong password. It is a common component which can be freely reused anywhere for showing short messages to the user.
Refactored error messares in backend