documentation: expanding subprocesses and new types of flows; translations updated
+ icon of subprocess is not shown when subprocess is expanded
container labels update (fold/expand)
relative label coordinates
Merge branch 'bpmn_examples' of github.com:Ashatta/qreal into bp-0.3.0

Conflicts:
	plugins/rulesChecker/rulesChecker_ru.qm
	plugins/rulesChecker/rulesChecker_ru.ts
	qrgui/umllib/label.cpp
	qrgui/umllib/label.h