Nyall Dawson 08d30c3b9f [processing] Add method for algorithms to preprocess parameter values
Allows algorithms to pre-processes a set of parameters, allowing the
algorithm to clean their values.

This method is automatically called after users enter parameters, e.g.
via the algorithm dialog. This method should NOT be called manually
by algorithms.
2018-04-03 18:36:39 +10:00
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