Gxformat2

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* Various fixes, allow id map style workflow input definitions.

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* More fixes for PJA, add the ``doc`` keyword to format 2 workflows to match CWL workflows. Map to and from native Galaxy workflows as annotations.

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* Fixes for exporting PJA when exporting workflows from native .ga to format 2.

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* Fixes for exporting workflow outputs from native .ga to format 2, support for modern map style output definitions like CWL 1.0.

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* Fixes for exporting subworkflows from native .ga to format 2.

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* More cwl style inputs, initial work on conversion from native workflows, various small fixes and tweaks.

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