Supporting variable TABLE length.

The new commit supports variable table length. At least 2 points must be present within the table. The table "curve" must have only one inflection point.
Now the --show option shows the table "curve" even if the tanh() fitting was not successful.
.tgzs were updated.

[endre@dudu LTSpice]$ ./softtable.sh --show 'TABLE {V(35,3)} ((-1,-1n)(0,0)(2.00,1n))(2.2,1))'
[ERR 2013.03.02 14:59:07.062 softtable.Main.main(182)] Tables with this slope distribution ([1.0E-9, 5.0E-10, 4.999999]) are not handled!
[endre@dudu LTSpice]$