Some more serialization of stuff around localizations

[HechtiDerLachs]

ping @antonydellavecchia

[antonydellavecchia]

see comments and suggestions

[codecov]

Codecov Report

Attention: Patch coverage is 75.53191% with 23 lines in your changes missing coverage. Please review.

Project coverage is 84.34%. Comparing base (4f654db) to head (213695a).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Serialization/main.jl	0.00%	15 Missing ⚠️
src/Serialization/Rings.jl	94.66%	4 Missing ⚠️
src/Serialization/parallel.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4773      +/-   ##
==========================================
- Coverage   84.35%   84.34%   -0.02%     
==========================================
  Files         675      676       +1     
  Lines       91069    91176     +107     
==========================================
+ Hits        76825    76903      +78     
- Misses      14244    14273      +29     

Files with missing lines	Coverage Δ
src/Rings/mpolyquo-localizations.jl	74.63% <ø> (+0.15%)	⬆️
src/Serialization/Rings.jl	96.53% <94.66%> (-0.43%)	⬇️
src/Serialization/parallel.jl	87.25% <0.00%> (-3.57%)	⬇️
src/Serialization/main.jl	86.72% <0.00%> (-4.22%)	⬇️

... and 6 files with indirect coverage changes

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