Refactor baseline config helpers

This merge requests aim to cleanup the helpers for defining face recognition helpers. Cf. also this issue

Should me merged jointly with bob.pad.face!117 (merged)

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changed title from Refactor baseline config helpers to WIP : Refactor baseline config helpers

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• d34a578e - Add PAD cropping default. Add function to select default cropping from a mode given as a string

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• 6e201f17 - Fix lookup of database config (previous version did not work)

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• 9c50df1a - Missed ArcFace in previous commit 6e201f17 (Fix lookup of database config)

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• d9b94d07 - Added face crop examples in the doc

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mentioned in merge request bob.pad.face!117 (merged)

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• 4474cff1 - [Doc] Fix formatting

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• 773972d2 - [Doc] Fix build

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• 6dd7d184 - Putting MTCNN as default annotator everywhere

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unmarked as a Work In Progress

changed title from WIP : Refactor baseline config helpers to Refactor baseline config helpers

assigned to @amohammadi

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• 5e49ee7b - Move get_default_cropped_positions to bob.bio.face.helpers

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• ea461fff - Fix circular import

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