Fixed grid switching
Fixed hanging when saving settings
Fixed #543
Proceeding fixing hanging on linux
Fixed hanging
Fixed 2Model wall drag overlapping
Fixed 2D model wall refusing to start dragging near the robot
Fixed gentle fantom absence error reporting
Merge branch 'master' of github.com:qreal/qreal into robots

Conflicts:
	qrkernel/settingsDefaultValues
Merge pull request #626 from dvvrd/robots

Набор фиксов для QReal::Robots #1