Create a single snapshot file with multiple timesteps #253
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At the moment we are writing a separate snapshot file for each time-step. This makes it difficult to visualise the time evolution in Paraview without additional processing of the snapshot files. This PR changes this so that now it will write a single snapshot bp file with multiple timesteps that we can visualise in paraview.
If we want to export a single timestep we can use ADIOS utilities to do so.
Fixes #249