Add auto-buddy feature for published rosters

[Peter2121]

No description provided.

[smokku]

I'd rather see it as a separate option, not a magic number under fix-subscriptions.

Also, there is no reason to change whitespace formatting in lines you do not need to change.

[Peter2121]

The problem of separate option is that this option will conflict with fix-subscriptions. That's why I used the 'magic number'. In that case we need to add something like super-option subscriptions with two possible options inside - fix-subscriptions and auto-buddy. But this approach will completely break the compatibility of config files with previous versions and it needs more modifications in the code of reading config (so more possible bugs).
I would like to get your advise on it.

[smokku]

There is no conflict, just a requirement.
New option <auto-budy/> needs <fix-subscriptions/> turned on to work. Just make it clear in the comment explaining the option.

[Peter2121]

New option auto-buddy needs fix-subscriptions turned OFF to work.

If you think it's OK like this - I'll try to go this way, but I need some time to change it.

[Neustradamus]

@smokku @Peter2121 Any news?