Survex 1.0.22 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 -
the changes aren't relevant for these.

Here's the usual summary of changes in 1.0.22:

* aven: Fixed handling of extended elevations (and other flat surveys) -
  they are meant to be "locked flat" but this wasn't fully working before.

* Documentation: 3d v3 file format description: fixed error in description of
  codes 0x01-0x0e; include it in binary packages (not only with the source
  code).

Cheers,
Olly