ePiX package missing

[Akira Kakuto]

> If it's already in the distros (presumably could be done for
> other os's easily enough), I see little reason to add it to TL.

ePiX seems to require c++ and bash for users. So it will be
appropriate for 'unix' distributions, but it may not be appropriate
for TeX Live, where Windows is also supported.

Thanks,
Akira