Use a default tank when populating tank data after download

This is super-simplistic and also is kinda wrong. It forces all tanks that
haven't been specified by the DC (so far only Atomics Aquatics Cobalt and
UEMIS Zurich (which doesn't even use libdivecomputer) to be AL80. Just as
we used AL80 as default for manually adding tanks.

Obviously this needs to become an option where the user can pick.

See #145

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Create a text entry for default cylinder in preferences

We don't do anything with this just yet.
And frankly, a drop down of the cylinders that we know of would be even
better. But hey, it's a start.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Use the default cylinder if defined

With this every cylinder downloaded from a divecomputer that doesn't
provide cylinder data, and every cylinder manually added anywhere will
default to the default cylinder that is set in the preferences.

For people who most of the time dive with the same equipment (always on
dive boats with AL80, or almost always diving their personal HP119) this
should be a nice improvement.

If you don't like this behavior, simply leave the default cylinder setting
in the preferences empty.

This commit also fixes the incorrect s->value call (should be
s->setValue). I wonder what this did to the default filename before...

Fixes #145

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

This fixes the INSTALL instructions. The line to install home-brew is missing the “install” at the end and a small typo in the marble compilation instructions.

Saludos,

Pablo.

From 152395059af546273f38721e5c8ae1d19e2d73c3 Mon Sep 17 00:00:00 2001
From: Pablo Wolter <pwolter@gmail.com>
Date: Sat, 23 Nov 2013 16:10:02 -0800
Subject: [PATCH] Small correction to the installation instructions. Added
 "install" to the end of the ruby command to install homebrew and a typo in
 the compilation instructions for marble.

Signed-off-by: Pablo Wolter <pwolter@Pablos-MacBook-Pro.local>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Adding trip based statistics

This adds trip based statistics to the Yearly Statistics
view.

Signed-off-by: Miika Turkia <miika.turkia@nixu.fi>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>