ENH: Reports use the default template from niworkflows, allowing overwrite

[oesteban]

Addresses the problem spotted by @josephmje in nipreps/dmriprep#28 (comment)

[codecov]

Codecov Report

Merging #419 into master will decrease coverage by 5.93%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
- Coverage   59.21%   53.27%   -5.94%     
==========================================
  Files          46       46              
  Lines        5036     5036              
  Branches      683      683              
==========================================
- Hits         2982     2683     -299     
- Misses       2008     2234     +226     
- Partials       46      119      +73

Flag	Coverage Δ
#masks	?
#reportlettests	?
#unittests	?

Impacted Files	Coverage Δ
niworkflows/reports/core.py	70.55% <50%> (-9.21%)	⬇️
niworkflows/func/util.py	24.65% <0%> (-53.43%)	⬇️
niworkflows/interfaces/fixes.py	41.17% <0%> (-45.1%)	⬇️
niworkflows/engine/workflows.py	26.31% <0%> (-15.79%)	⬇️
niworkflows/interfaces/bids.py	80.15% <0%> (-15.48%)	⬇️
niworkflows/interfaces/utility.py	75.92% <0%> (-12.97%)	⬇️
niworkflows/utils/bids.py	76.25% <0%> (-12.5%)	⬇️
niworkflows/interfaces/itk.py	28.39% <0%> (-10.5%)	⬇️
niworkflows/interfaces/registration.py	51.93% <0%> (-10.31%)	⬇️
niworkflows/interfaces/utils.py	38.24% <0%> (-9.98%)	⬇️
... and 8 more

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