Trac #13884 - fix most broken internet optional doctests
Added upstream patch to deal with pkg-config not detecting freetype2
Merge branch 'develop' into ticket/16047 so I can push to Trac
Trac #13884: Fix optional internet tests.

Untested = broken.

{{{
        sage -t --only_optional=internet
devel/sage/sage/symbolic/integration/integral.py # 2 doctests failed
        sage -t --only_optional=internet
devel/sage/sage/combinat/words/paths.py # 1 doctests failed
        sage -t --only_optional=internet
devel/sage/sage/misc/preparser.py # 1 doctests failed
        sage -t --only_optional=internet devel/sage/sage/interfaces/r.py
# 1 doctests failed
        sage -t --only_optional=internet
devel/sage/sage/finance/stock.py # 11 doctests failed
        sage -t --only_optional=internet
devel/sage/sage/databases/sloane.py # 8 doctests failed
}}}

The files `sage/databases/sloane.py` and `sage/combinat/words/paths.py`
are really covered by #10358.

The file `sage/interfaces/r.py` is a situation needing clarification at
#7771.

This ticket is to fix the minor issues in the integral, preparer, and
stock files.

'''Apply''':
* [attachment:trac_13884.patch]
* [attachment:trac_13884_addon1.patch]

URL: http://trac.sagemath.org/13884
Reported by: robertwb
Ticket author(s): Karl-Dieter Crisman
Reviewer(s): Ralf Stephan, Volker Braun
Trac #16047: Fix mpl header search issues on OS X 10.4

I have no idea whether this is really just an issue on this platform,
but it was discovered here.  Thanks to ppurka for tracking down the
likely culprit for this failure
[http://trac.sagemath.org/ticket/16002#comment:18 here].
{{{
matplotlib-1.3.1
====================================================
Setting up build directory for matplotlib-1.3.1
Finished set up
****************************************************
Host system:
Darwin Dasher-03.local 8.11.0 Darwin Kernel Version 8.11.0: Wed Oct 10
18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC Power Macintosh
powerpc
****************************************************
C compiler: gcc
C compiler version:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/Users/student/Desktop/sage-6.2.beta5/local/libexec/
gcc/powerpc-apple-darwin8.11.0/4.7.3/lto-wrapper
Target: powerpc-apple-darwin8.11.0
Configured with: ../src/configure
--prefix=/Users/student/Desktop/sage-6.2.beta5/local --with-local-
prefix=/Users/student/Desktop/sage-6.2.beta5/local --with-
gmp=/Users/student/Desktop/sage-6.2.beta5/local --with-
mpfr=/Users/student/Desktop/sage-6.2.beta5/local --with-
mpc=/Users/student/Desktop/sage-6.2.beta5/local --with-system-zlib
--disable-multilib --disable-nls
Thread model: posix
gcc version 4.7.3 (GCC)
****************************************************
NOTE: Set SAGE_MATPLOTLIB_GUI to anything but 'no' to try to build the
Matplotlib GUI.
Not building any matplotlib graphical backends.
patching file lib/matplotlib/tri/_tri.cpp
patching file lib/matplotlib/tri/_tri.h
patching file setup.py
========================================================================
====
Edit setup.cfg to change the build options

BUILDING MATPLOTLIB
            matplotlib: yes [1.3.1]
                python: yes [2.7.5 (default, Mar 26 2014, 08:50:37)
[GCC
                        4.7.3]]
              platform: yes [darwin]

REQUIRED DEPENDENCIES AND EXTENSIONS
                 numpy: yes [version 1.7.0]
              dateutil: yes [using dateutil version 2.2]
               tornado: yes [tornado was not found. It is required for
the
                        WebAgg backend. pip/easy_install may attempt to
                        install it after matplotlib.]
             pyparsing: yes [using pyparsing version 2.0.1]
                 pycxx: yes [Couldn't import.  Using local copy.]
                libagg: yes [pkg-config information for 'libagg' could
not
                        be found. Using local copy.]
              freetype: no  [The C/C++ header for freetype2 (ft2build.h)
                        could not be found.  You may need to install the
                        development package.]
                   png: yes [pkg-config information for 'libpng' could
not
                        be found. Using unknown version.]

OPTIONAL SUBPACKAGES
           sample_data: yes [installing]
              toolkits: yes [installing]

OPTIONAL BACKEND EXTENSIONS
                macosx: no  [skipping due to configuration]
                qt4agg: no  [PyQt4 not found]
               gtk3agg: no  [Requires pygobject to be installed.]
             gtk3cairo: no  [Requires cairo to be installed.]
                gtkagg: no  [skipping due to configuration]
                 tkagg: no  [skipping due to configuration]
                 wxagg: no  [skipping due to configuration]
                   gtk: no  [skipping due to configuration]
                   agg: yes [installing]
                 cairo: no  [cairo not found]
             windowing: no  [skipping due to configuration]

OPTIONAL LATEX DEPENDENCIES
                dvipng: no
           ghostscript: no
                 latex: no
               pdftops: no

========================================================================
====
                        * The following required packages can not be
built:
                        * freetype
Error building matplotlib package.

real    0m10.504s
user    0m4.290s
sys     0m2.525s
************************************************************************
Error installing package matplotlib-1.3.1
************************************************************************
}}}

See [https://gist.github.com/anonymous/8075373 another]
[https://github.com/Homebrew/homebrew-python/issues/74 reports on]
[https://github.com/Homebrew/homebrew-python/issues/62 homebrew] for
something very similar.  [http://trac.macports.org/ticket/41593 Here]
[https://github.com/Homebrew/homebrew-versions/pull/302 are some]
[https://github.com/matplotlib/matplotlib/pull/2623 fixes].  Somewhat
surprisingly, the [https://github.com/efiring/matplotlib/commit/be37790f
449641a6ead3af2d2334cc544789e869 mpl commit] is a one-liner.

URL: http://trac.sagemath.org/16047
Reported by: kcrisman
Ticket author(s): Karl-Dieter Crisman
Reviewer(s): Volker Braun