Redid vcproj for DevStudio builds
 - Updated files for 2011.1
 - Rename libqhull to libqhull6 in accord with qhull6.dll
 - Added qh_QHpointer_dllimport to work around MSVC problem
 - user_eg.c: Added test of qh_qh for qh_QHpointer_dllimport
 - qhull-exports.def: Identify data items
 - qhull-exports.def: Add VERSION
 - Add test for executables to q_eg, etc.
 - Add explanation of user_eg* to user_eg prompts
 - index.htm: Fix MATLAB links
 - QhullFacet: Added isSimplicial, isTopOrient, isTriCoplanar, isUpperDelaunay