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- Adapt to nbxmpp supporting OMEMO
- Move python-axolotl code into backend folder

Daniel Brötzmann authored Oct 12, 2018 and Philipp Hörist committed Oct 13, 2018

- Port Fingerprint dialog from openpgp plugin
- Add an InfoBar for errors and informations
- Add tooltip for device clearing
- Remove fingerprints tab from plugin config dialog

Fixes #267

Even if we dont need account for omemo, its easier to supply always
the same count of arguments to all encrypt_file() plugin methods.

Now we dont need to supply the account

- PEP is not reliable enough for now, so we have to use this as
fallback

- create a OMEMOConnection class to mimic more how Gajim does things

This is necessary because Gajim is with 0.16.11 a python package

This reverts commit 346da609

The HTTPUploadPlugin calls that if encryption is enabled

A patch in Gajim made that unnecessary

- unused import
- unused var GAJIM_VERSION
- redundant self.plugin = self
- simplify condition
- redundant 'else'