Updated build system with Makefile, and DevStudio sln and vcproj files.

 - The DevStudio/msvc build does not work for shared libraries (dll)
 - Fixed QhullFacet::PrintRidges to check hasNextRidge3d()
 - Cleaned up Qt project files
 - Fixed Makefile for shared libraries
 - Moved libqhull to libqhullstatic, as done in CMakeLists
 - Made libqhull a shared library
 - Restored /INCREMENTAL:NO since CONFIG -= incremental did not work
 - Added 'facets' argument to user_eg3.cpp