New Features in Coin v4.0.3

This is a bugfix release.

This is a brief summary of the new features in Coin v4.0.3:

- Added support for building modern styled documentation.
- Set minimum C++ standard needed to compile Coin to C++11.

Bug fixes:

- Fixed LTOcompilation ODR error.
- Fixed suspicious increment in SbProfilingData.cpp.
- Fixed SbTri3f intersect calculation.
- Improved auto clipping.
- Fixed orthographic autoclipping by allowing negative farDistance.
- Fixed rotating a VRMLBackground node with its ancestors' rotations.