For https://gitlab.indiscale.com/caosdb/customers/icbm/management/-/issues/47 (https://gitlab.com/linkahead/linkahead-crawler/-/issues/64). Implements units in crawler. Also changes a bit the behavior when property values are given as dicts in the cfood definition (value is parsed in the same way as a single string, collection_mode is not mandatory anymore).
The main changes are in the handle_value function that now determines the property value, the collection mode, and the property unit (which defaults to None, of course).
New unit tests (and the fact that despite the introduction of units, the old unit and integration tests still pass) should be sufficient. Feel free to test this crawler version with your favorite example though, to make sure that it didn't have any unwanted side effects.
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