Proposed Fix. Make sure we read all data from our SSL socket wrappers and don't just rely on gobject.io_add_watch, select or poll.

This isn't really a clean solution, but the less intrusives fix that I can think of. Fixes #2634.

Fix a potential bug of missing an alarm_callback. Separate public from internal API.

we have that in all files. To at least lesser the confusion a bit, add
vim tags for that.
Additionally, fix wrong #! in a few files.

- improved HTTP persistent connections
- added alarm-unregister method to idlequeue
- extended proxy managing dialog for BOSH proxy

persistent HTTP connections in BOSH roughly implemented, added hack for openfire incapability of after-SASL-stream-restart-response in BOSH, changed doubles quotes to single

This is, however, only a half fix as this fixes that it fails when
there's None in waiting_descriptors[2], but actually, there never
should be None, so I have to investigate why there was none.

This patch is, however, correct and needed and the other queues also
have that check. It's just that I also need to fix the reason for
the None in the queue.

BOSHClient transformed to NonBlockingBOSH transport - it's easier to maintain more connections from below, implemented handling of non-persistent HTTP connections - it runs with ejabberd, improved NonBlockingTransport interface, minor changes in BOSHDispatcher

moved bosh code from client_nb.py to bosh.py, replaced debug logging with debug.py by logging in whole xmpppy (debug.py is now unused)

in Client now
- Added NonBlockingHttpBOSH transport (to tranports_nb) and BOSHClient
(to client_nb)
- Extended possible proxy types in configuration by "BOSH" proxy
- Rewrote NonBlockingTLS to invoke success callback only after successful TLS handshake is over (formerly, the TLS Plugin returned right after sending <starttls>)

in this case we wait only for close events

when pollend event is raised

untill there is a stable 2.8 version

Removed threads and mutexes in connection.py
and gajim.py.
Add resolver through nslookup command, removed
dnspython and pydns (for now).