Reimplement the Sort method to change from Tree / List, and remember selection.

Things are working as they should, but I hit on -probably- a Qt bug
that makes painting on the table view a bit weird ( it only updates
the painting by moving the mouse around ). I'll try to fake the
mouse movements in a couple of commits after this one.
There's also a few columns that are not being correctly sorted,
probably something to do with the SortRole.

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
More work on bug 111, Sorting works as it should.

Sorting is now working as it should, changing
from table to tree, keeping the selection from
table to tree ( but there's a regression on
tree to table conversion, I'll try to fix it
in the following commit. ).

this commit also cleans a lot of boilerplate
code that I wrote to bypass a graphics bug,
that I seem to have correctly fixed in this
version.

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Fixed the regression of selection not being stored from table to tree

This fixes the regression that I caused in the last commit,
where the selection was being correctly reestored from tree-to-table,
but it was incorrectly being restored from table-to-tree.

I also added a bit of speedup on the view while changing columns.

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Code Cleanup.

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Code layout changes

Tomaz convinced me (with help from Linus) that it might be a good idea
to go with the compacter "single line" case statements in some specific
instances where this makes the code much more compact and easier to
read.

While doing that I changed Linus' code to do 'retVal = ...; break;'
instead of just 'return ...;' - this is more consistent and makes
debugging a little easier.

And while doing all that, I also cleaned up divelistview.cpp a little bit.
And removed an unused variable.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Ignore ui_* files

This makes using git from within QtCreator much easier.
Fix sorting by rating

In commit beb4ed38f264 ("Add a "sort role" for sorting the dive list")
Linus forgot to add a case for the rating value.

Now all columns sort correctly.

With this I think we can close the bug...

Fixes #111

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Stop building prefs.c

The only tiny function in there that was still needed seems to fit
nicely into main.c

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