v1.00
18 January, 2005
Original release

v1.01
29 January 2005
Added chi2inv, finv, tinv functions using Solve. VERY SLOW.
Edited distribution functions to make parameters more readable.
Added TI-92 Plus and Voyage 200 groups.

v1.02
19 October ,2006
Correctd gammalwr, so chi2cdf works for x=0
Changed geompdf so x=0 returns 0, instead of error
Changed geomcdf so x=0 returns 0, isntead of error.