Fixed #680
Fixed #1194 and segfault when dragging element from user palette
Removed brackets from element name when creating it by dragging from the palette
Merge pull request #1195 from dvvrd/fix680

Groups as root diagrams and explosion targets
Merge branch 'master' of https://github.com/qreal/qreal into trikDemos

Conflicts:
	plugins/robots/editor/generated/robotsMetamodel.xml