Bump Healpy to 1.11.0

This updates healpy to the latest upstream release.

Update healpy install technique

v3.31.3

Update version.

Update Healpy to 1.10.3

This updates the healpy installation to the upstream 1.10.3 release which fixes several deprecation errors.

Update healpy to 1.10.1

This release merges in a more up-to-date version of upstream healpy.

Update to upstream version 3.31

This updates the source to the versions released in official HEALPix version 3.31.
healpix-autotools-3.31.0.tar.gz

Small fix to autoconf macro to support latest python 3.5

Trivial changes to allow configure to find python 3.5

Small fix to installed data directory names.

v3.30.1

Change data directory to healpix, rather than the package name.  Bump…

First release of upstream version 3.30

v3.30.0

Add generated healpy files to gitignore.