Correction in function tDist?

Dear Khaled,

thank you for the wonderful package. I think I found a mistake with the estimation of tails in the tDist function. It seemed odd that the two-tailed solution would give half the p-value of the single-tailed.

I think line 693 of kashi.php should be:

return $result * $tail / 2;

I am not a stats expert as much as you, so I may have misunderstood something. I mostly relied on online calculators to verify results.

Best greetings from Greece,
Pavlos