Complex arg-trig functions

[Stephen Montgomery-Smith]

OK, I believe that I have implemented all your suggested changes - but 
with style changes that I prefer.

Test it now, and see if it works.

As for formatting problems caused by the perl scripts, I would 
anticipate that by the time it gets committed, that people would no 
longer use the perl scripts.  But it is a realyl convenient way to make 
big changes to catrig.c, and then copy these same changes to catrigf.c 
and catrigl.c.

As far as I can see, the only formatting mess ups are multiple double 
spaced blank lines.  I think I have got rid of them now.