Replace add_torrent with async_add_torrent

[Doadin]

​http://dev.deluge-torrent.org/wiki/Plan/libtorrent

Other potential changes Replace add_torrent with the more efficient non-blocking async_add_torrent.

[Cas]

I'm afraid that patch is incorrect plus it is more complicated than simply renaming the method call to libtorrent.

From lt man:

In order to add torrents more efficiently, consider using async_add_torrent() which returns immediately, without waiting for the torrent to add. Notification of the torrent being added is sent as add_torrent_alert.

[Doadin]

I was just starting to work on it. Mostly just opened this because there isnt a ticket for this item yet? So more just a spot to work on it and add patches and what not so its easy to collaborate on the issue.

[Cas]

I appreciate the ticket being opened but the patch is no good, clearly untested and changes code that is irrelevant to the issue.

[Cas]

Milestone renamed