cf discussions in https://git.openrobots.org/issues/211

liblzma is the XZ-format compression library.

XZ is the successor to the Lempel-Ziv/Markov-chain Algorithm compression
format, which provides memory-hungry but powerful compression (often
better than bzip2) and fast, easy decompression.

The native format of liblzma is XZ; it also supports raw (headerless)
streams and the older LZMA format used by lzma.

The list of required packages in fedora was not complete.

Remove the old mk/sysdep/antlr2.mk since the devel/antlr2 replaces
it.

The new variables are :
ANTLR_BIN and ANTLR_LIB
respectively pointing to the antlr's binary and the library

Fixes some missing character, sorry for multiple commits

If a file needs to depend on antlr 2.7.0 or above, but before 3.0.0

From the website:

libQGLViewer is a C++ library based on Qt that eases the creation of
OpenGL 3D viewers.

It provides some of the typical 3D viewer functionalities, such as the
possibility to move the camera using the mouse, which lacks in most of
the other APIs. Other features include mouse manipulated frames,
interpolated keyFrames, object selection, stereo display, screenshot
saving and much more. It can be used by OpenGL beginners as well as to
create complex applications, being fully customizable and easy to
extend.

Correct the minimal version number. Make it possible to compile
hatpconsole with libgraphviz-2.20.2.

Not sure if the library behaves the same way as the "normal"
library libgraphviz-2.26.3

Correct the version number to find and the way to find it

Correct Fedora and Debian names to match with real names.
Error reported by Robert Bulk, corrected thanks to Anthony

hatpconsole was missing libgvc that can be found in graphviz.
Modify the Makefile to add the dependency, and add the file to
find the libgvc (from graphviz). If a project needs libgvc it
should use the file mk/sysdep/libgraphviz.mk instead of the
mk/sysdep/graphviz.mk in order to get the libraries.
As this was a minor change, update the PKGREVISION.

- Detect external dependencies in RobotPkg (sphinx, pyopenl).
- Package external dependency python-simpleparse.
- Teach RobotPkg how to install setuptools based packages
  (rules are duplicated for now in python-simpleparse and
   robot-viewer packages).