replace PIL with Pillow
Pillow: re-resolve #9864
doc: remove now unused environment variables
Pillow: fix patch to work against 2.2.2
Upgrading to current upstream stable release
Also added license information to the SPKG.txt file.
Patching libpng to allow compilation of libfreetype-2.5.2
Fixed patching of libpng.
15145: add instructions to construct all groups of order 15 or less as fp groups
#15145: review patch.
actually delete the file
Trac 15564: Fix typo in doc of toric_varieties.torus
Fixed failing doctest.
remove PIL (it has been replaced by Pillow)
Pillow -> pillow
sage-fix-pkg-checksums: appropriately handle uncompressed tarballs
Updated Sage version to 6.1.beta2
Trac #15570: sage-fix-pkg-checksums doesn't properly handle uncompressed tarballs

This was a minor annoyance for #15569.

URL: http://trac.sagemath.org/15570
Reported by: ohanar
Ticket author(s): R. Andrew Ohana
Reviewer(s): Volker Braun
Trac #15539: use Pillow instead of PIL

PIL is has not been maintained an a few years. Pillow is the canonical
fork of PIL that most distributions have switch to using, we should do
the same.

Upstream Tarball: [[https://github.com/python-
imaging/Pillow/archive/2.2.2.tar.gz|Pillow-2.2.2.tar.gz]]

URL: http://trac.sagemath.org/15539
Reported by: ohanar
Ticket author(s): R. Andrew Ohana
Reviewer(s): François Bissey
Trac #15561: freetype 2.3.5 is too old for some fonts of current systems.

The now-current freetype library has problems with newer fonts. This
forbids its uses in some applications on machines having system fonts
not supported by this version.

This was diagnosed on sage's R (see
[https://groups.google.com/forum/#!topic/sage-support/FnTEcpfg6wE this
thread]) by Volker Braun.

A stopgap measure is to upgrade freetype to a more forgiving version of
freetype, hence this ticket.

The current freetype tarball hits a snag in libpng, because it uses
setjmp for exception handling, which triggers a compiler error due to
this settinng up been made twice. So a small patch to the current libpng
is part of this branch.

New tarball: http://download.savannah.gnu.org/releases/freetype/freetype
-2.5.2.tar.bz2

URL: http://trac.sagemath.org/15561
Reported by: charpent
Ticket author(s): Emmanuel Charpentier, Volker Braun
Reviewer(s): Volker Braun
Trac #15564: Doc misformatting in toric varieties

While building the docs, I noticed
{{{
[schemes  ] /home/king/Sage/git/sage/local/lib/python2.7/site-
packages/sage/schemes/toric/library.py:docstring of
sage.schemes.toric.library.ToricVarietyFactory.torus:7: WARNING: Inline
interpreted text or phrase reference start-string without end-string.
}}}

URL: http://trac.sagemath.org/15564
Reported by: SimonKing
Ticket author(s): Simon King
Reviewer(s): Volker Braun