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

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.37%. Comparing base (da98713) to head (4c6d665).
⚠️ Report is 197 commits behind head on master.

Files with missing lines	Patch %	Lines
ocrd_calamari/recognize.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            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     

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