Fix some comments.
Merge branch 'master' of https://github.com/simbody/simbody
Refactor assembler headers and source to separate out assembly conditions.
Add some missing overrides.
Initial checkin of OrientationSensors. This is untested code not yet ready to run. But it does compile.
Add the OrientationSensors header file so it will come with Simbody.h.
Fix sign error in gradient.
Add ExampleIMUTracking to test & demo new OrientationSensors assembly condition.
Tilted the head IMU in the example to make sure that non-bodyframe IMU orientation works.
Add missing documentation for Rotation::convertRotationToQuaternion() and convertRotationToAngleAxis().
Use multiplatform copy
Merge pull request #240 from xantares/copy

Use multiplatform copy
MinGW-64 fixes
Merge pull request #239 from simbody/feature-orientation-sensor-for-Assembler

Add orientation sensor (IMU) as an assembly condition for IK
Use CMAKE_HOST_SYSTEM_NAME instead of PLATFORM_NAME.
Merge pull request #241 from xantares/native-win32

MinGW-64 fixes
Fix Windows build (broken by PR #241).
- Restored now-missing PLATFORM_ROOT variable which was still in use
- Removed early return() in case of non-Windows. I want to keep this working for auxiliary files in case we need some later. Since there is no MingW directory, this should do nothing if that is the host system name.
Merge pull request #242 from simbody/fix_windows_build

Fix Windows build (broken by PR #241).
No platform files for non-native win32 builds

I'm very sorry I removed the PLATFORM_ROOT definition and broke the build, it should not have happened.
It is ok now.
Merge pull request #243 from xantares/patch-1

No platform files for non-native win32 builds