Merge branch 'pr1613'

Persistent friends aliases, finally fixes #697

I discovered that the problem of temporary aliasing (which is a bug, according to #697) lied in the wrong config workflow: alias is being written to config object in memory, but not recorded to config file. This patch makes sure that new alias will get rendered in config file.

src/widget/friendwidget.cpp

@@ -250,6 +250,7 @@ void FriendWidget::setAlias(const QString& _alias)
     Friend* f = FriendList::findFriend(friendId);
     f->setAlias(alias);
     Settings::getInstance().setFriendAlias(f->getToxID(), alias);
+    Settings::getInstance().save(true);
     hide();
     show();
 }