[ENH] add F test

[Remi-Gau]

relates to #244

• implement F test at the run level
• implement F test at the subject level

Unrelated

• fix PDF building of the doc (though html link to svg images in the symlinked general_info.md) will be an issue to deal with
• fix bidsConcatBetaTmaps to force it to run on the root node of the model and remove possibility to delete the beta maps

[codecov]

Codecov Report

Merging #584 (7edae94) into dev (89eef2c) will increase coverage by 0.36%.
The diff coverage is 89.06%.

@@            Coverage Diff             @@
##              dev     #584      +/-   ##
==========================================
+ Coverage   73.76%   74.12%   +0.36%     
==========================================
  Files         197      199       +2     
  Lines        4738     4777      +39     
==========================================
+ Hits         3495     3541      +46     
+ Misses       1243     1236       -7     

Flag	Coverage Δ
unittests	74.12% <89.06%> (+0.36%)	⬆️

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

Impacted Files	Coverage Δ
src/batches/stats/setBatchContrasts.m	100.00% <ø> (ø)
src/batches/stats/setBatchGroupLevelContrasts.m	100.00% <ø> (ø)
src/batches/stats/setBatchSubjectLevelResults.m	52.63% <0.00%> (ø)
src/utils/deregexify.m	0.00% <0.00%> (ø)
src/utils/rmTrialTypeStr.m	42.85% <42.85%> (-23.81%)	⬇️
src/subject_level/specifyContrasts.m	89.23% <94.44%> (+9.23%)	⬆️
src/batches/stats/setBatchSubjectLevelContrasts.m	94.73% <100.00%> (+1.87%)	⬆️
src/bids_model/checkContrast.m	38.46% <100.00%> (ø)
src/bids_model/getContrastsList.m	95.65% <100.00%> (-0.35%)	⬇️
src/utils/getRegressorIdx.m	100.00% <100.00%> (ø)
... and 4 more

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