opencmis CMISQL grammar is not standard compliant

Our antlr grammar is not compliant to CMIS 1.0:

1)
DISTINCT is not allowed as keyword in CmisSQL

2)
The rule "string value function" is no longer supported. It existed in earlier versions of the spec but was removed. The grammar in our code does not reflect this change in the specification.

3)
only allowed operator with any is "=". The rule "quantified comparison predicate" was changed in the spec from allowing multiple comparison operators to only allow "=". The grammar in our code does not reflect this change in the specification.