Survex 1.0 within sight

[Gavin Lowe]

>You mean like "*calibrate compass ..." and "*calibrate declination ..."?
>That's been in for years, and is documented:

You're quite right!  I missed it.

I thought of another thing that would help to catch some user errors (at
least, some of this user's errors).  If a survey leg or an *equate command
refers to a station using a (non-empty) prefix, and that station doesn't
otherwise exist, then it's likely that the user has cocked up the prefix in
some way.  It's very easy to get this sort of thing wrong when changing the
way you structure the survey data, so it would be nice if Survex gave a
warning. 

For example, at one time I had a command something like

*equate shaft.e17 GSP.e17

which worked.  But then I edited the GSP data so that GSP.e17 became
GSP.spacetrout.e17, and forgot to change the above command to

*equate shaft.e17 GSP.spacetrout.e17  

It took me a long time to spot the dangling leg and correct it.  It would
have been nice if Survex had warned me that there was no longer a station
GSP.e17.

Gavin