[Ticket #13686] Octave Portfile upgrade and maintainership

[Takeshi Enomoto]

Hello all,

I did not have problems on Intel Mac but on iMac G5.
So I make small changes for 2.9.15.
Portfiles for versions 2.9.17 and 3.0.1 seem to be ready
and 2.9.19 is available.

IMHO, octave3 deserves a different port since it is said
``significantly different''.


Regards,

Takeshi