Survex 1.0.26 released

[Olly Betts]

Download from the usual place:

http://www.survex.com/download.html

No versions for RISC OS and MSDOS on 286 or earlier machines this time.
If you're using one of these and want a newer version, feel free to prod
me.

Here's the usual summary of changes in 1.0.26:

* cavern: Fixed interleaved topofil data style - the length was always being
  calculated as zero.

* (Unix version): aven: "All Files" now shows files without extensions too.

* aven: added Ctrl+Q as shortcut for File->Exit.

* aven: depth colouring now uses a proper colour gradient.

* (MacOS X version): aven: the keyboard and mouse now work!  It turns out that
  we must apply resources *after* installing.

* (MacOS X version): aven: now works when run from the MacOS X Finder.

* (MacOS X version): look for message files and other resources relative to the
  binaries so that the user can install Survex from a disk image in the location
  of their choice.

* (MacOS X version): fixed not to try to build aven if wxWindows isn't
  installed.

* cad3d: fixed -e and -r options to not crash (the long versions have always
  worked).

* extend: fixed to initialise an internal structure - failing to do so was
  probably causing crashes on some platforms.

* Fixed standard graphics for "Note", "Warning", etc in the PostScript manual.

* Documentation updated.

* (Unix version): fixed svxedit man page which previously contained xcaverot
  documentation!

* test suite: check that cavern doesn't report "nan" or "NaN" for any values.

* (Unix version): fixed configure --enable-defaultlang=XX to work.

* (Unix version): fixed configure code to turn on lots of GCC warnings and fixed
  most of them.

* (MS Windows version): assorted tweaks to allow building with MS Visual C/C++.

Cheers,
Olly