Minor modifications to allow compilation with Visual Studio 2013
(a.k.a. VS 12). Some obscure missing std:: functions were finally
added, and std::max and std::min require <algorithm> to be
included now.
- Modify CMakeLists to avoid warnings in VS 2013 64 bit builds (/arch:SSE2 unrecognized). SSE2 is the default for that compiler.
- Fixed caching problem that prevented BUILD_INST_SET changes from taking effect. This required removing the compiler command line variables from the cache; those are no longer changeable from CMake.
Update version number to 3.3.1.