The group list is always sorted aphabetically but the user list is not.

[jkeltz]

Issue Description

Since the group list is sorted automatically, I assume that the user list in each group should be sorted automatically as well. As it stands right now, add users: a,c,b and it will remain like that. In VirtualGroups.php saveConfig function after the $lines=[...] line add:

uksort($config, function($a, $b) {
    return strcmp($a, $b);
});