RFC: Harmonize parameters for similar processors

[stweil]

Both ocrd-tesserocr-deskew and ocrd-cis-ocropy-deskew are used to deskew a page or all regions of a page. They also both have a parameter to decide which operation is desired:

• ocrd-tesserocr-deskew: operation_level ["page", "region"]
• ocrd-cis-ocropy-deskew: level-of-operation ["page", "region"]

Ideally the parameter names for identical functionality should be identical for all processors.
It would also be nice to harmonize the use of underscore or minus sign in parameter names.

[kba]

parameter to decide which operation is desired

Best discussed in OCR-D/spec#136

It would also be nice to harmonize the use of underscore or minus sign in parameter names.

I prefer dashes though I'm not always consistent myself.