Clean and update CMake superbuild sub-projects
Minor modifications in CMake configurations of superbuild sub-projects.
- Build Ceres with CXX11 support as C++11 standard is already used
- Build Ceres and Glog as shared libs (used multiple times)
- Use official Glog version tag (v0.4.0) instead of commit as the release is now available
- Remove Eigen and Flann tests building
- Fix CMake variables names
- Set PCL C++ standard to 14 as requested in doc.
- Remove unused install path for individual sub-projects
- Use same CMake boolean convention (ON/OFF) for better clarity