Cahnges to airy (was changes to trigi, trigo, and logarc)

> From: Barton Willis 
> 
> > I am thinking of extending your use of use CL
> > functions for double float evaluation of trigonometric
> > functions using double-float-eval to the airy function
> > code in src/airy.lisp.
> 
> > It looks reasonably simple once I work out how to
> > access the double-float-op hash table from outside
> > trigi.lisp.
> 
> >Do you think this is a good idea?
> 
> I think this would be OK; your code might shorten
> to something like

I've done this.  I needed to modify complex-number-p to handle %i.  
This didn't seem to be an issue for trig functions, probably since 
they are simplified cos(%i) -> cosh(1) and so on.

I also removed the duplicate definitiion of complex-number-p.


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