Bug as reported by Yorick: When two Assets have the same capture
date, a bug occurs in the interface where the user gets stuck in
a loop when moving to the next image.
This patch uses the primary key as a fallback when ordering the
images by capture date. This way, the asset ordering is complete
and it should resolve the bug.
The ConfirmDelete page now uses parts of the photopage. The
Confirmation dialog is its own template which is based on Alert.
The database now updates the album thumb to the most recent
addition to the album, when the album thumb asset is being deleted.
When there are no pictures left in the album 0 will be set.
