Modified netpbm installation answers for Mac OS systems

Until now, we installed `netpbm' by setting the default paths to
libraries and headers. That worked fine for GNU/Linux systems, however,
in Mac OS systems we have to explicity say to `netpbm' questions what
are the paths to the libraries and headers. We found this problem
because we tried to run `solve-field' to obtain the astrometry of some
images, and then it goes to use `pnmfile', a program that failed because
it was not properly linked with `libnetpmb'.

With this commit, we fix this problem by answering properly the
questions in the configure step of `netpbm' and setting explicity where
we want to place the libraries and headers. With this commit, we also
update `netpbm' version. To do that, we have to download the last
version, for which it doesn't exist a tarball. So, we built this tarball
and put it in the Mohammad's webpage.

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