init from constructor not during process

[bertsky]

In preparation of upcoming API changes and to facilitate usage in the existing workflow server...

[codecov-commenter]

Codecov Report

Merging #65 (4c6d665) into master (da98713) will decrease coverage by 0.38%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
- Coverage   88.75%   88.37%   -0.39%     
==========================================
  Files           2        3       +1     
  Lines         169      172       +3     
  Branches       38       39       +1     
==========================================
+ Hits          150      152       +2     
  Misses         11       11              
- Partials        8        9       +1     

Impacted Files	Coverage Δ
ocrd_calamari/recognize.py	87.95% <66.66%> (-0.54%)	⬇️
ocrd_calamari/__init__.py	100.00% <0.00%> (ø)

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