- Use default camera settings
- Change method of calculating head movement in trackball
	modified:   brain/src/behavior/skattacker/skattacker_1.py
	modified:   brain/src/behavior/skcalibrate/skcalibrate_1.py
	modified:   brain/src/behavior/skcalibratetest/skcalibratetest_1.py
	modified:   brain/src/behavior/sktrackball/sktrackball_0.py