EHN: throw error when the users uses white spaces as a part of numbers

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

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