F mixed write transactions

Tests for caosdb-server!35 (merged) and caosdb-cpplib!26 (merged)

mentioned in merge request caosdb-server!35 (merged)

mentioned in merge request caosdb-cpplib!26 (merged)

added 1 commit

• f9c94085 - STY: formatting

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added 1 commit

• 5984e2ac - TST: add test for string id in a transaction

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requested review from @daniel

LGTM, please decide if my comments need to be resolved. If not, merge at will.

added 1 commit

• 1ce8a605 - TST: resolve pending TODOs

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added 2 commits

• fdd432e0 - 1 commit from branch dev
• 76f5787c - Merge branch 'dev' into f-mixed-write-transactions

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resolved all threads

mentioned in commit c455ad55

merged