FG21sim: v0.7.0

Now, for each cluster, all its merging history in the past, e.g., 3 Gyr, are
saved and used to calculate the radio halo properties.

* The cluster catalog is first padded to have the same length due to different
  number of merger events for each cluster, and is saved into a CSV file
  similar to that of the halos CSV catalog, and is also dumped in the pickle
  format.  All merger events are saved.

* Add RadioHaloAM class to use all simulated merger events of a cluster to
  determine its radio halo properties.

* TODO: more tests and tune parameters
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