Describe default time and date

Mention what is used by default for time and date when creating a new
dive. (And fix upper case elsewhere.)

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Describe the editing mode only once

Describe the editing mode only once when going through entering dive
information by hand and not when describing each tab.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Not possible to delete first cylinder

Describe that used cylinders cannot be deleted and first cylinder is
used implicitly.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Some more clarifications and fixes to user manual

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Update spanish translation of user manual to english bfca2dc

Signed-off-by: Salvador Cuñat <salvador.cunat@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Manual - survey

Possible wording for the survey bit
Is this the right place to put it?
Will probably need an image, but that would be better from Willem's
environment for the look to be consistent.

Signed-off-by: Tim Wootton <tim@tee-jay.demon.co.uk>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
User manual: text to explain the user survey

I modified Tim Wooton's text, among others doing it in the writing
style of the manual (e.g. no second person).

Signed-off-by: Willem Ferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>