ENH: config option to write crashfiles in plain text

[mgxd]

Inspired by the eons it took to unpickle the first crash...

also #1184

[satra]

@chrisfilo - you should review this !

[codecov-io]

Codecov Report

Merging #1885 into master will decrease coverage by 0.01%.
The diff coverage is 41.17%.

@@            Coverage Diff            @@
##           master   #1885      +/-   ##
=========================================
- Coverage   73.11%   73.1%   -0.02%     
=========================================
  Files        1061    1061              
  Lines       53375   53389      +14     
=========================================
+ Hits        39025   39029       +4     
- Misses      14350   14360      +10

Flag	Coverage Δ
#unittests	73.1% <41.17%> (-0.02%)	❌

Impacted Files	Coverage Δ
nipype/utils/config.py	61.7% <ø> (ø)	✅
nipype/pipeline/plugins/tests/test_base.py	100% <ø> (ø)	✅
nipype/utils/filemanip.py	84.75% <11.11%> (-2.43%)	❌
nipype/pipeline/plugins/base.py	65.44% <75%> (-0.07%)	❌

---

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[codecov-io]

Codecov Report

Merging #1885 into master will increase coverage by 2.05%.
The diff coverage is 41.17%.

@@            Coverage Diff            @@
##           master   #1885      +/-   ##
=========================================
+ Coverage   70.94%     73%   +2.05%     
=========================================
  Files        1057    1061       +4     
  Lines       53142   53410     +268     
  Branches     7699       0    -7699     
=========================================
+ Hits        37703   38990    +1287     
- Misses      14065   14420     +355     
+ Partials     1374       0    -1374

Flag	Coverage Δ
#smoketests	?
#unittests	73% <41.17%> (+2.6%)	✅

Impacted Files	Coverage Δ
nipype/utils/config.py	61.7% <ø> (-5.32%)	❌
nipype/pipeline/plugins/tests/test_base.py	100% <ø> (ø)	✅
nipype/utils/filemanip.py	84.39% <11.11%> (-0.59%)	❌
nipype/pipeline/plugins/base.py	65.44% <75%> (+4.15%)	✅
nipype/utils/tests/test_filemanip.py	80.54% <0%> (-12.67%)	❌
nipype/interfaces/spm/base.py	71.37% <0%> (-11.24%)	❌
nipype/utils/provenance.py	67.86% <0%> (-8.2%)	❌
nipype/interfaces/bru2nii.py	66.66% <0%> (-7.41%)	❌
nipype/interfaces/dcm2nii.py	36.71% <0%> (-6.77%)	❌
... and 723 more

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[chrisgorgo]

Looks great! One thing I would suggest is changing text_crashfiles to crashfile_format = txt | pklz. Also please update the documentation explaining the new option.