Survex 0.98 prerelease 5 available

[Olly Betts]

This prerelease is available for all platforms:

http://www.survex.com/

All the programs which read .3d files now support --survey to restrict their
operation to a subsurvey of the .3d file.  This feature requires additional
information in the .3d file, so won't work on .3d files produced by early
versions of cavern.

If you find any problems with this prerelease, please report them promptly.
Mark and I are both off to CUCC's Austria expedition at the end of the week,
and I'd like to be able to release 0.98 before we go.

Full list of user-visible changes between 0.98-prerelease4 and
0.98-prerelease5:

* aven/print*/cadgen/extend/diffpos/3dtopos: Added --survey command
  line option to restrict the operation of the command to a sub-survey
  in the .3d file.

* aven: initial scaling now ignores unused fixed points (unless there
  are no legs at all), and scales survey so it fits inside window.

* aven: can now load a survey with no legs, only stations.

* aven: --version now works, and --help produces more helpful output.

* cavern: fixed bug with eating first character of line after
  interleaved data; corrected line numbers in some situations
  involving interleaved data.

* cavern: fixed problem with points fixed with errors.

* cavern: *title without quotes now stops at a comment; *title with no
  argument no longer allowed - use `*title ""' if you really mean to
  set an empty title.

* Minor documentation updates.

* 3dtopos: Fixed bug which resulted in station names and coordinates
  getting mismatched; output now defaults to current directory.

Cheers,
Olly