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
Fixed #674
Merge branch 'master' of github.com:qreal/qreal into fix674
Merge pull request #4 from dima6120/edge

Added edges aligning to grid
Fixed slow element addition to scene
Merge branch 'fix674' of git://github.com/dvvrd/qreal
Merge pull request #767 from dvvrd/fix674

Fixed #674
Merge pull request #768 from dvvrd/fix676

Fixed #676
Version incremented to 2.3.1
Installing to C:\QRealRobots by default, warning about spaces and brackets.
Merge pull request #769 from dvvrd/robots231

QReal:Robots 2.3.1
Merge branch 'master' of https://github.com/qreal/qreal into installer