Integrate gamma_incomplete



I made some improvements in handling errors.  I added my name at the top and a ? mark.

Here it is attached again.

It can be improved further, I don't know if it is worth the effort.  I could also handle other cases that are doable and 
that this program can't do.  Maybe I will post this to my site instead of attaching to this email from now on.

Rich
 
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