Merge branch 'dev' into f-doc-query

CHANGELOG.md

src/main/java/org/caosdb/server/jobs/core/ExecuteQuery.java

src/main/java/org/caosdb/server/query/CQLLexer.g4

src/main/java/org/caosdb/server/query/CQLParser.g4

src/main/java/org/caosdb/server/query/POV.java

src/main/java/org/caosdb/server/utils/ServerMessages.java

src/test/java/org/caosdb/server/query/POVTest.java

src/test/java/org/caosdb/server/query/TestCQL.java