GitLab

* Add the SSH key as a variable
* Encrypt the file containing this variable

* Add graphics role
* Add Microsoft fonts to clients' role

* Update PyCharm to 2017.3
* Add removal of old PyCharm installations

* Fix issue #18

* Add texlive-latexdiff for producing LaTeX documents as a diff of
LaTeX-documents (a bit like trackchanges
* Add a4wide
* Add systemdocu LaTeX dependencies
* Arial probably not working (no testcase)
* Fix issue #16 and #17
* Make rule idempotent

* Add las122

* Add a role for EPICS base on Fedora
* Add basic support for talking to KARA's PVs
* Neither support for all further packages used at KARA nor any used for
the Jena-project