Release candidate for Qhull 2012.1

[Brad Barber]

Hi all,

See below for the Qhull 2012.1 release candidate.  It is not deployed to 
qhull.org, because I need feedback on the changes.   The goal of this release 
is to clean up the builds and make them suitable to Octave, R, and other users. 

If something is broken for you in Qhull 2012.1, please let me know. 

Qhull 2012.1 adds libqhull.so for Octave and other users.  This shared library 
uses a static global data structure .   It is the same as the debian build, 
Qhull 2009.1.  To help avoid confusion, libqhull6_p.so is the new name for 
qhull with a dynamic global data structure (-Dqh_QHpointer).

Qhull 2012.1 fixes strict aliasing in qset.c and adds a qset test program.

Qhull 2012.1 includes a draft debian build in the 'config/' directory.  Someone 
will need to verify that it works.   As before, it produces libqhull.so and the 
qhull executables.  It could be updated to match the other builds.

A later version of Qhull may include a third interface to get rid of global 
variables.  It would pass qh_qhT as a parameter to each function call.  There 
would be a single source tree using a macro to enable the extra parameter.  
There would be a third shared library, tentatively named libqhull7_t.so for 
"threading".   If so, the C++ interface will probably switch to this library.   

   http://gitorious.org/qhull/
   http://gitorious.org/qhull/qhull/blobs/master/src/Changes.txt
   http://www.qhull.org/download/qhull-2012.1-src-tgz.md5sum
   http://www.qhull.org/download/qhull-2012.1-src.tgz
   http://www.qhull.org/download/qhull-2012.1-zip.md5sum
   http://www.qhull.org/download/qhull-2012.1.md5sum
   http://www.qhull.org/download/qhull-2012.1.zip

Many thanks for helping with qhull.

                                        --Brad