Confidence indicators for procedures.

[John Darrington]

Executing procedures involving very large data sets obviously takes a
finite time.  If people are going to have confidence in the GUI, they
need to have some sort of indication that the procedure is running,
and an idea of how far it is away from completion.

It is possible to add some sort of callback in procedure.c and/or
casreader-*.c ?  (There are a number of while loops --- I'm not sure
which will need attention)  The trick is, not to allow the confidence
indicators themselves to significantly increase execution time.  So
instead of reporting at each iteration, it would be best to report at
pre-determined intervals of real time.

J'



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