- Removed some unused parts from tarball as described in README.

- update to 2.6.1, a bugfix release for 2.6.0 with little improvements
as well.
Changelog: https://github.com/owncloud/client/releases/tag/v2.6.1

- Require python3-nautilus instead of nautilus: the py2 variant of
the plugin has been dropped (EOL of py2 approaching) and the
owncloud plugin has been able to handle py3 already for a while.

- Update to Version 2.6.0 with the following major changes:
Major changes and additions:
* Rewrote discovery code for performance improvements and better maintainability.
* Tech Preview: Add native virtual files mode for Windows 10.
(https://github.com/owncloud/client/wiki/Virtual-Files-on-Windows-10)
* Tech Preview: Improvements and fixes for all virtual files mode
(https://github.com/owncloud/client/wiki/Virtual-Files)
* Add basic support for libcloudproviders for gtk/gnome integration (#7209)
* Remove support for Shibboleth auth, please use OAuth2 server app (#6451)
* Many bugfixes and other improvements, more to read at
https://github.com/owncloud/client/releases/tag/v2.6.0

- Update to 2.6.0 RC4.

- Update to 2.6.0 RC2.

- Update to 2.6.0 RC1.

- Explicitly require zlib to build owncloud-client.