ENH: Add default transform, intensity scaling files to RobustTemplate

[effigies]

Changes proposed in this pull request

• Allows transform_outputs=True and scaled_intensity_outputs=True to create files with default names, rather than pre-specifying.

From the docs:

OPTIONAL FLAGGED ARGUMENTS
	--lta <tp1.lta> <tp2.lta> ...
		output xforms to template (for each input)
[...]
	--iscaleout <is1.txt> <is2.txt> ...
		output final intensity scales (will activate --iscale)

[codecov-io]

Codecov Report

Merging #2141 into master will decrease coverage by 19.98%.
The diff coverage is 13.33%.

@@            Coverage Diff             @@
##           master   #2141       +/-   ##
==========================================
- Coverage   72.18%   52.2%   -19.99%     
==========================================
  Files        1158     119     -1039     
  Lines       58020   23901    -34119     
  Branches     8334       0     -8334     
==========================================
- Hits        41884   12478    -29406     
+ Misses      14814   11423     -3391     
+ Partials     1322       0     -1322

Flag	Coverage Δ
#smoketests	52.2% <13.33%> (-19.99%)	⬇️
#unittests	?

Impacted Files	Coverage Δ
nipype/interfaces/freesurfer/longitudinal.py	64.86% <13.33%> (-19.52%)	⬇️
nipype/pipeline/plugins/callback_log.py	12% <0%> (-80%)	⬇️
nipype/workflows/smri/freesurfer/ba_maps.py	11.11% <0%> (-79.17%)	⬇️
nipype/workflows/rsfmri/fsl/resting.py	14.51% <0%> (-70.97%)	⬇️
nipype/workflows/smri/freesurfer/autorecon2.py	2.68% <0%> (-68.59%)	⬇️
nipype/workflows/smri/freesurfer/autorecon3.py	2.43% <0%> (-66.67%)	⬇️
nipype/pipeline/plugins/pbsgraph.py	29.41% <0%> (-64.71%)	⬇️
nipype/workflows/smri/freesurfer/bem.py	38.46% <0%> (-61.54%)	⬇️
nipype/interfaces/utility/csv.py	42.85% <0%> (-57.15%)	⬇️
nipype/workflows/smri/freesurfer/recon.py	9.28% <0%> (-56.43%)	⬇️
... and 1094 more

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