another RFC for trip handling

[Dirk Hohndel]

Linus,

here's my latest attempt to get the trip handling moved forward.
This is OFF by default. You need to enable it in preferences and then
restart the program (yeah, I know - stupid... I'll fix that later).

It then creates time based groups and stores them in the XML file as
something like

<trip number='12' date='2012-08-23' time='09:25:31'>
  <location>San Diego, CA, USA</location>
</trip>

The logic handles the ability to decare dives as not part of trips - but
no UI exists to make that happen (yet).

/D

The following changes since commit 5726a50d89d1f76b6bc2cfb96568d41d27f2b63e:

  Improve group selection semantics (2012-08-20 06:45:56 -0700)

are available in the git repository at:

  git://git.hohndel.org/subsurface.git trips

for you to fetch changes up to ea847dafb20bc3e91677ed28c9655c6e79ccaf28:

  First cut of explicit trip tracking (2012-08-26 15:23:48 -0700)

----------------------------------------------------------------
Dirk Hohndel (1):
      First cut of explicit trip tracking

 dive.c      |   5 +++
 dive.h      |  23 ++++++++++++++
 divelist.c  | 174 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------------------------
 gtk-gui.c   |  20 +++++++++++-
 parse-xml.c |  13 +++++++-
 save-xml.c  |  38 ++++++++++++++++++----
 6 files changed, 191 insertions(+), 82 deletions(-)