opencv: Switch to an option to disable OpenCL

OpenCV 2.4.5 enables OpenCL by default (on most platforms), so switch to
having an option to disable the OpenCL module.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
opencv: Automatically disable OpenCL for pre-Lion

In particular, OpenCL 1.1 is required by OpenCV 2.4.5+, which is
unavailable in any pre-Lion version of OS X.

Closes #206.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
radx 20130412

Closes #155
radx 20130531

Closes #205
samtools: HEAD is hosted on GitHuB
galib: The lib dir has to be created at first
qgis: Fix python support
vtk: Fix python support
vtk: fix depends_on
vtk: has no python3 support
qgis: cmake needs help to find python inc/lib
qgis: don't use which_python but python.xy
openCV: Fix Python & patch for OpenCL headers
vtk: Correct caveats
ray 2.2.0
spades 2.4.0: New formula
vtk: fix caveat wording of option
vtk: Fix missing python bindings

The `make install` has do be done inside the
`python do`-block because the PYTHONPATH
is set up correctly there (but no more
outside of the block).
vtk: Solve link conflickt. Avoid easy-install.pth

We need to pass --single-version-externally-managed
and --record=installed.txt to the setup.py in order
to avoid distutils writing an easy-install.pth that
will conflict with the one already installed.
fastx_toolkit: Remove --disable-debug

`--disable-debug` causes `fastx_trimmer` to crash.
Closes #216