Survex 1.1.7 development snapshot uploaded

[Olly Betts]

I believe I've now fixed all the problems reported in 1.1.6, so here's
1.1.7:

http://www.survex.com/software/1.1.7/

Please note that this is a test build of the development version.
Things should mostly work, but you're a lot more likely to encounter
problems than with the stable 1.0.X versions.  I'd certainly not
recommend installing this as your only survex version and going on
expedition...

But please do download it, try it out, and report any problems.

Changes in 1.1.7:

* cavern: Add validity checking for dates in *date commands (with feature
  test in testsuite).  A date entered as just "year" or "year.month" now
  becomes a date range for the relevant period (previously it became a single
  date near the middle of that period).

* extend: Fixed 2 uninitialised flags (should fix erratic behaviour on
  with MS Windows).

* extend: Default output name for a file called input.3d is now input_extend.3d
  rather than just extend.3d (which was annoying if you wanted to extend
  several surveys in the same directory).

* aven: OpenGL 2.0 always includes support for point sprites so rework
  our check for them to include that knowledge.

* aven: Regenerate depth bar if user switches to/from metric units.

* aven: Don't clear the "there" mark just because the mouse pointer has
  moved off a station.

* aven: When processing a .svx file, put the resultant .3d file in the
  same directory (since that's where we then try to load it from).

* aven: Fix labelling of date colouring on 32 bit platforms.

* aven: If "colour by date" is on and we load a survey with no date info
  (or all surveyed on the same date) then set "colour by none".

* aven: Make the error dialog modal and remove a signal handler once it
  has fired to prevent endless (or seemingly endless) cascades of error
  dialogs.

* aven: Enforce a minimum object volume diameter of 1m to avoid problems
  if a survey file with only one station in is loaded.

* aven: Fix problems with indicators disappearing when we're drawing
  blobs and/or crosses the slow (but always supported) way.  (Problem
  introduced in 1.1.6).

* (Unix version): aven: Really stop setting extra toolbar margin when using
  GTK2.0.  The attempt to fix this in 1.1.3 failed because __WXGTK12__ is
  set for GTK+ 1.2 or *any later release* so is true for GTK+ 2.0 too!

* (Unix version): aven: Add details of which of wxGTK, wxMotif, and wxX11
  we've been compiled with, and which GTK+/Motif version where appropriate.

* (Unix version): Fixed build on Fedora Core 3.

* documentation: Updates to 3d file format specification from Mike McCombe.

Cheers,
    Olly