Made a new snapshot

Changelog:
-- Common --
  * TikZ and Sketch interface fixed

-- Fan --
  * new product client

-- Graph --
  * Johnson graph client
  * complement of a graph

-- Matroid --
  * Lattice of flats
  * direct and 2-sum
  * parallel and series extensions
  * circuits via 4ti2
  * new properties

-- polytope --
  * various minor bugfixes

-- bundled --
  * update singular interface
  * libnormaliz v 2.11.2
  * TOSimplex: OpenMP support