obsfate: add a new obsfate template
The obsfate template display for each obsolete changeset a line summarizing
what changed between the changeset and its successors.
This dict is computed in obshistory._preparesuccessorset. It uses
obshistory.FORMATSSETSFUNCTIONS which is a list of function that
individually compute a part of each dict. You can override fields or add new
ones by adding your own function in this list.
The format of obsfate is computed in templatekw.obsfatedefaulttempl and can be
wrapped if necessary, the code is not quite extendable for the moment but can
be refactored later.
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