Enhance handling with many users

[ali]

I would like to report to you some stuff that I thought must be done and appreciate if you could issue it basically.

1. In my configuration, and then the phonebook, if we have 10,000 contacts, we will have a long list, which if I decide to delete them, I have to press the Delete button one by one, go to the homepage of mysms, go to phonebook again, and then delete the next one. This is not possible for 10,000 contacts. So what I suggest, is, instead of using buttons of delete, use checkbox inputs and then a Select All/None will solve it all.
2. The next is about the usergroups, where you have let's say for example 10,000 people in the phonebook, and you want to assign them to a new usergroup, selecting them one by one using the checkbox sucks, 10,000 ticking is impossible, so also a Select All/None will help a lot here.
3. If we already have a usergroup, how can we add a new contact to it, having all the old ones, just adding more to it??

Thanks for your great job mate! ;-)
Ali.

[axel]

@moved to backlog