Survex 0.99 prerelease 7 available

[Olly Betts]

This prerelease is available for all platforms except MSDOS on pre-386
machines and RISC OS (I'll try to build those next week):

http://www.survex.com/

Still not sorted out everything that's been reported, but the previous
prerelease was missing aven.exe on MS Windows, which really needed
correcting urgently.

Full list of user-visible changes between 0.99-prerelease6 and
0.99-prerelease7:

Changes in 0.99-prerelease7:

* (MS Windows version): aven was missing from 0.99-prerelease6
  (if you installed over an old version you'd have kept the old aven).

* caverot/xcaverot: Ctrl + Arrow keys is now the preferred way to
  rotate and tilt (easier to remember than "C"/"V" and "'"/"/").

* xcaverot: Shift-ed movement keys now work faster as in caverot.

* cavern: fixed *calibrate depth/todepth/fromdepth/dz and *units dz to
  work in data styles diving and cylpolar.

* cavern: fixed handling of malformed *data commands.

* Various documentation clarifications.

Cheers,
Olly