v0.3.57

Trixi v0.3.57

Diff since v0.3.56

Closed issues:

• Weird screen output behaviour: alive and analyse "forgotten"? (#759)

Merged pull requests:

• update to MPI.jl v0.19 (#749) (@ranocha)
• use number of accepted steps for output callbacks (#771) (@ranocha)
• removing FillArrays (now unused) (#775) (@jlchan)