Gxformat2

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* Allow another API return option for experimental tool creation API.

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* Implement change datatype PJA.

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* Implement experimental CWL-style step defaults (see Galaxy PR 6850).

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* Various small fixes for changes in 0.7.1.

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* Add some basic test cases.
* Allow ID-map style listing of steps.
* Ordered load (in addition to existing dump functionality) or ordering of steps in ID-map style variant works.
* Allow CWL-style $graph defs that can define multiple workflows in a single file.
* Initial work on de-duplicating subworkflow definitions on import.
* Fix position handling while exporting workflow.

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* Fix export of non-data parameters and implicit workflow connections.

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