GitLab

* 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

* installed is no longer supported
* some fixes in handlers

Patch CMakeLists.txt

build directory is no longer part of the git repo