Typing bugfixes

[tclose]

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Summary

• Fixes up the handling of typing of inputs with output_file_template defined
• Allows output_file_template to define tuple/list templates for options with multiple files paths (e.g. mrconvert --export_grad_fsl BVEC BVAL)
• More descriptive messages on typing errors: task and field provided along with type mismatch
• Adds fileformats.field types to default coercions, e.g. fileformats.field.Integer -> int and vice versa

Checklist

• [x] I have added tests to cover my changes (if necessary)
• [x] I have updated documentation (if necessary)

[codecov[bot]]

Codecov Report

Patch coverage: 96.00% and project coverage change: -0.35% :warning:

Comparison is base (91c5a15) 83.23% compared to head (07ce62a) 82.88%. Report is 2 commits behind head on master.

:exclamation: Current head 07ce62a differs from pull request most recent head 103cefc. Consider uploading reports for the commit 103cefc to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #687 +/- ## ========================================== - Coverage 83.23% 82.88% -0.35% ========================================== Files 22 22 Lines 4848 4873 +25 Branches 1392 0 -1392 ========================================== + Hits 4035 4039 +4 - Misses 809 834 +25 + Partials 4 0 -4 ``` | [Flag](https://app.codecov.io/gh/nipype/pydra/pull/687/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nipype/pydra/pull/687/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype) | `82.88% <96.00%> (-0.35%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files Changed](https://app.codecov.io/gh/nipype/pydra/pull/687?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype) | Coverage Δ | | |---|---|---| | [pydra/utils/typing.py](https://app.codecov.io/gh/nipype/pydra/pull/687?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#diff-cHlkcmEvdXRpbHMvdHlwaW5nLnB5) | `93.24% <90.00%> (+0.26%)` | :arrow_up: | | [pydra/engine/helpers.py](https://app.codecov.io/gh/nipype/pydra/pull/687?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#diff-cHlkcmEvZW5naW5lL2hlbHBlcnMucHk=) | `86.66% <100.00%> (+0.07%)` | :arrow_up: | | [pydra/engine/helpers\_file.py](https://app.codecov.io/gh/nipype/pydra/pull/687?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#diff-cHlkcmEvZW5naW5lL2hlbHBlcnNfZmlsZS5weQ==) | `92.59% <100.00%> (+0.24%)` | :arrow_up: | | [pydra/engine/specs.py](https://app.codecov.io/gh/nipype/pydra/pull/687?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#diff-cHlkcmEvZW5naW5lL3NwZWNzLnB5) | `94.75% <100.00%> (+0.03%)` | :arrow_up: | ... and [4 files with indirect coverage changes](https://app.codecov.io/gh/nipype/pydra/pull/687/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype)

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[tclose]

@djarecka I believe this is ready to merge now. The new SLURM test seems to be getting stuck somewhere

[effigies]

Merging so #684 can be rebased on master and reviewed more easily.