No "ARE" in query language

Currently, the query underlying the crawler that is given in https://gitlab.com/caosdb/caosdb/-/wikis/manuals/crawler/crawler#crawling, i.e., FIND Files WHICH ARE STORED AT /TestData/** results in an error since ARE is not defined in the query language. The correct query is FIND Files WHICH IS STORED AT /TestData/**, so this section in the wiki should be fixed. However, since "Files" is already in plural, the ideal solution is probably to add "ARE" as a synonym for "IS" to the CQL.

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