[ENH] Enhancements subject / group level GLM and results

[Remi-Gau]

• when in MNI space unless a mask is provided in the stats model, the default mask will be the SPM ICV mask
• allow to specify the threshold for inclusive masking in the GLM (if users don't want to tweak the spm_my_defaults)
• fix several bugs and refactor code for group level GLM and results
• skip contrast creation when a required condition in it is missing
• skip results computation when a contrast is missing
• possibility to cap the max number of volumes to include in a run (in case some runs were not stopped in time)
• allow for better multitask support

[codecov]

Codecov Report

Merging #443 (aef56ea) into dev (7e68bb3) will decrease coverage by 0.46%.
The diff coverage is 35.50%.

@@            Coverage Diff             @@
##              dev     #443      +/-   ##
==========================================
- Coverage   69.72%   69.25%   -0.47%     
==========================================
  Files         153      157       +4     
  Lines        3032     3100      +68     
==========================================
+ Hits         2114     2147      +33     
- Misses        918      953      +35     

Flag	Coverage Δ
unittests	69.25% <35.50%> (-0.47%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/batches/setBatchEstimateModel.m	56.25% <0.00%> (ø)
src/batches/setBatchGroupLevelContrasts.m	0.00% <0.00%> (ø)
src/batches/setBatchGroupLevelResults.m	0.00% <0.00%> (ø)
src/batches/setBatchResults.m	100.00% <ø> (ø)
src/bids_model/createEmptyModel.m	100.00% <ø> (ø)
src/utils/regexify.m	100.00% <ø> (ø)
src/utils/validationInputFile.m	70.58% <ø> (ø)
src/workflows/bidsCreateROI.m	0.00% <0.00%> (ø)
src/workflows/bidsFFX.m	69.76% <ø> (ø)
src/workflows/bidsRFX.m	0.00% <0.00%> (ø)
... and 13 more

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