Inching towards the 4.0 release

Updates to README, ReleaseNotes.txt and subsurface.pro

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Remove translations with insufficient coverage

Catalan, Croatian, Vietnamese and Indonesian all have less than 50%
coverage in their translations, so we had to remove them. Hebrew just
sneaked past this (rather arbitrary) cutoff.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Tweaking man page to better reflect current status

Small tweaks to reflect the recent changes in Subsurface.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Minor tweaks to the README

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
User manual: new banner image

This reflects the Qt version (and again matches the one on the web site).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Minor tweaks to INSTALL file

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Make the SupportedDivecomputers.html match web site

I had forgotten that I used <dl> and not <ul> for the dive computers on
the web site.

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