FIX: Qwarp in AFNI can have NIFTI and NIFTI_GZ as extensions

[gpiantoni]

Summary

outputtype of Qwarp can take three values ('NIFTI' or 'AFNI' or 'NIFTI_GZ') but the current code only handles the "AFNI" case. This bugfix uses the standard nipype syntax to get the extension and suffix for NIFTI and NIFTI_GZ.

It also fixes a small parsing error in getting the extension from out_file.

List of changes proposed in this PR (pull-request)

Acknowledgment

• [ x] (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[codecov-io]

Codecov Report

Merging #2921 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2921   +/-   ##
=======================================
  Coverage   67.51%   67.51%           
=======================================
  Files         344      344           
  Lines       44058    44058           
  Branches     5552     5552           
=======================================
  Hits        29746    29746           
  Misses      13566    13566           
  Partials      746      746

Flag	Coverage Δ
#smoketests	50.29% <0%> (ø)	⬆️
#unittests	64.97% <0%> (ø)	⬆️

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[effigies]

Hi @gpiantoni, can you rebase this against current master?

[oesteban]

Hi @gpiantoni, in addition to the rebase Chris requested, the title and description of this PR do not seem to match the proposed changes. Could you elaborate on that?

EDIT: Actually the rebase will solve the issue.