Block element creation in case of polygon outside of image

closes #976 (closed)

requested review from @erwanrouchet

assigned to @mlbonhomme

added 10 commits

• 92508cbc...0a9df780 - 9 commits from branch master
• 2c60dc8e - no element polygons outside images

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added 2 commits

• e4b66dee - 1 commit from branch master
• a16a246c - no element polygons outside images

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added 17 commits

• a16a246c...000398e0 - 15 commits from branch master
• d46b42a2 - no element polygons outside images
• c3feb847 - WIP: missing checks for transcription elements

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added 11 commits

• c3feb847...5e913cc4 - 8 commits from branch master
• fb5eacaa - no element polygons outside images
• 87bea2b1 - WIP: missing checks for transcription elements
• 398ec297 - add check on element-transcriptions-bulk

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resolved all threads

added 5 commits

• 398ec297...82864f3f - 2 commits from branch master
• a72d9e2a - no element polygons outside images
• 9738cb53 - WIP: missing checks for transcription elements
• dc501f23 - add check on element-transcriptions-bulk

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resolved all threads

added 4 commits

• 90f838e8 - no element polygons outside images
• 8f0b016d - WIP: missing checks for transcription elements
• 74ce7ce3 - add check on element-transcriptions-bulk
• 17da0462 - astuciously rename function

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