ReproIn: make specification of protocols2fix more flexible + do not bind fixup structs in func signatures

[yarikoptic]

First commit in the series describes problem at large

For some data we cannot rely on reliable presence of consistent study_description
across scans.  That results in the necessity to duplicate the same protocols2fix
records for multiple (not known in advance) study descriptions (actually -- their
hashes, which makes it even more difficult).  But in the cases with custom
overloads of protocols2fix, it is desired to just provide global rewrite rules,
which could be applied to any collection since they did follow some convention.

Now, with an empty "hash", those rules would be applied last, i.e. after possible
study-specific fixups applied.

As part of the solution I removed preliminary check to skip a call to
fix_dbic_protocol altogether.  It should be better this way.

I also removed binding of series_spec_fields and protocols2fix within function
signature.  It should allow easier overloading at the module level when needed

and subsequent commits improved it even further, but altogether removing function signature level bindings, adding matching study_description using regular expression (so it could then be crafted per lab etc).

Example log output on the adjusted tests:

INFO: Considering study (0e4497bdaae2608324a85be1f54f60ed) specific substitutions
INFO:  field1: '02-anat-scout_run+_MPR_sag' -> '02-anat-THESCOUT-runX_MPR_sag'
INFO: Considering '^my.*' regex matching substitutions
INFO:  field1: '02-anat-THESCOUT-runX_MPR_sag' -> '02-anat-THESCOUT_MPR_sag'
INFO: Considering global substitutions
INFO:  field1: '02-anat-THESCOUT_MPR_sag' -> '02-anat-scout_MPR_sag'
INFO: Considering study (0e4497bdaae2608324a85be1f54f60ed) specific substitutions
INFO:  field2: '11-func_run-life2_acq-2mm692' -> '11-func_run+_task-life_acq-2mm692'
INFO: Considering '^my.*' regex matching substitutions
INFO: Considering global substitutions

[yarikoptic]

eh, 3.5 and 3.6 " AttributeError: module 're' has no attribute 'Pattern'"

[codecov]

Codecov Report

Merging #425 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #425      +/-   ##
==========================================
+ Coverage   74.71%   74.84%   +0.13%     
==========================================
  Files          35       35              
  Lines        2760     2771      +11     
==========================================
+ Hits         2062     2074      +12     
+ Misses        698      697       -1     

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[yarikoptic]

tests pass, changes shouldn't break anything, will merge in a day or two unless hear otherwise