User manual: Little add on Dropbox services.

All dive log movements are made on the local copy, then uploaded to
Dropbox server when there is an avaliable internet conection.

Signed-off-by: Salvador Cuñat <salvador.cunat@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Update spanish translation of user manual to english 061f158

Signed-off-by: Salvador Cuñat <salvador.cunat@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
User manual: Four very small corrections and additions

Signed-off-by: Willem Ferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Added a button to hide a picture from the dive.

This patch hides a picture from the dive, it should actually
remove it, but because I didn't found a quick way to remove
a picture from the dive yet, it just hides it.

To remove a picture from the dive, the DivePictureItem has to
remember the QUrl of the original file, to remove that from the
model, and currently it only has the QPixmap.

this can be for 4.2.1 or we can postpone 4.2 a tiny bit since this
is a important feature.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Instead of holding the index, hold the URL.

Since the idea is to remove the picture in the future, we need
to not hold the row on the model, as when we delete one, the
other pictures will change the row. but the QUrl is unique.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Implement the functionality of remove_picture.

Added the remove_picture functionality, with code
shamelessy stolen from remove_event, and hoock it
up with the interface.

Fixes #650

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>