F grpc f value and unit

Summary

Fixes for #169 (closed) and caosdb-cpplib#10 (closed)

• The values are returned in their "native" representation, e.g. as integer, double or boolean.
• The units are inherited correctly and returned correctly.

Focus

• The units have not been returned because the Entity.hasUnit method doesn't do what we would expect it to do (for several reasons, mainly because the serialization of the unit for the REST-API works differently.)
• Also, I noticed that the units are not inherited as expected because of a missing "inheritance" flag (which is not part of the GRPC-API yet).
• The values needed to be parsed prior to the serialization with parseValue() in order to output them in their "native" representation.

Test Environment

Integration tests in caosdb-cppinttest!13 (merged) should do it.

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src/main/java/org/caosdb/server/datatype/BooleanValue.java

@@ -39,6 +39,6 @@ public class BooleanValue extends AbstractEnumValue {
   }
 
   public boolean getValue() {
-    return toString().equals("TRUE");
+    return toDatabaseString().equals("TRUE");
   }
 }