Create Tutorial for "Replay Mode"

[BenjaminRodenberg]

[richahert]

The replay mode is a feature that helps to test the participants. .vtk files generated by preCICE in a previous simulation can be written to preCICE by ASTE instead of a second solver.

TO DO:

• Extend ASTE to vector coupling
• Write scripts that generate files for ASTE from vtk output
• Make a tutorial that explains this feature for new users

[BenjaminRodenberg]

Intermediate summary on this issue:

We have three PRs that should in the end resolve this issue:

1. Read-Only functionality for coupling FEniCS with aste fenics-adapter#70 (merged)
2. Vectors for Replay Mode aste#9 (stalls)
3. WIP: aste Replay Mode tutorial on elastic flap case #73 (depends on Vectors for Replay Mode aste#9)