HP41: accuracy of 13-digit routines

[Ángel Martin]

it's good to have you there watching over - sorry about the bogus data point in x=-0.5, it turns out i was using an older version of the SandMath on my CL - version control is not my forte... this weekend I'll update the CL flash library witht he latest revisions.

Great to hear you're on to an updated coefficient set - I look forward to it and getting the code squeaky clean with the new values - those .3 seconds and 44 bytes do make a difference - remember than GAMMA is used as subroutine in several other functions in the module, like Bessel and a few more.

'AM