Prevent using uninitialized variable

numberOfPictures was be read before it is written.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Start a user survey dialog

The idea is that a week after the user starts using Subsurface we ask them
if they would like to submit a survey response.

If you are running a development build, don't wait seven days.

This patch doesn't do anything with the user's selections, doesn't submit
anything to our server, etc. It's just a placeholder to tune what we
should ask, etc.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>