Nyall Dawson 8a84e134cc Algorithms don't have to be split to prepare/process/postProcess
Since it's safe to evaluate parameters in background threads
now, it's usually going to be ok to evaluate everything in
the processAlgorithm step.

This keeps the algorithm code as simple as possible, and will
make porting faster.

Note that the prepare/postProcess virtual methods still exist
and can be used when an algorithm MUST do setup/cleanup work
in the main thread.
2017-07-07 09:28:19 +10:00
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