added alignment edges
added automatic application of alignment
fixed edge alignment
Merge remote-tracking branch 'trunc/robots' into edge
minor correction
Merge remote-tracking branch 'trunc/robots' into edge
fixed square line bug
fixed moving links in group when alignment is enabled
auto alignment after changing alignment settings
Merge pull request #4 from dima6120/edge

Added edges aligning to grid
Merge branch 'robots' of github.com:dvvrd/qreal into robots

Conflicts:
	qrgui/umllib/nodeElement.cpp
Merge branch 'master' of github.com:qreal/qreal into robots
Merge pull request #789 from dvvrd/robots

Fixed #517