Need to update .pro and build files.

 - Fix strncat limit in rboxlib.c.  More to do.
 - Qt project files: Remove gcc options from DevStudio builds
 - libqhull.pro: Comment out -Wno-sign-conversion
 - qt-qhull.cpp: Move QHULL_USES_QT before the includes
 - qvoronoi.htm: Remove quotes from qvoronoi example
 - qhull-cpp.xml: Add naming conventions, try, Temporarily, p, end, private, error
 - Changes.txt: More to do.  Links to build systems

Fix comments on warnings

- Add libqhull5 to Readme, Announce, download
- Reviewed #pragma
- Reviewed FIXUP and assigned QH tags
- Replaced 'up' glyphs with »
- Moved cpp questions to http://www.qhull.org/html/qh-code.htm#questions-cpp
- Moved suggestions to http://www.qhull.org/html/qh-code.htm#enhance
- Moved documentation requests to http://www.qhull.org/html/qh-code.htm#enhance

Moved qtpro/ and vcproj/ into project/
Updated documentation for 2010.1
Add reviewed results of q_test and qhulltest
Fixed an error message

Removed no_strict_aliasing.
Renamed index to idx to avoid shadowing BSD strings.h [kwilliams]

g++ -O2 works OK with gcc 4.4.0
eg/q_test produced some problems to chase (see Changes.txt)
Passes qhulltest --all

Added project files for qhull programs
Changed qh_gethash to return an int
Changed qh_addhash to take an int