bugfixing
Merge branch 'develop' of https://github.com/Caleydo/caleydo.git into develop
bugfixing
fix #1476 double-click
Merge branch 'develop' of https://github.com/Caleydo/caleydo.git into
develop

Conflicts:
	org.caleydo.core/src/org/caleydo/core/view/opengl/layout2/AGLElementView.java
Merge branch 'develop' of https://github.com/Caleydo/caleydo.git into
develop

Conflicts:
	org.caleydo.core/src/org/caleydo/core/view/opengl/canvas/AGLView.java
fix #1476 visibility states