fixup! Add test case for many-to-many with property ref

Escape column names for Firebird and Oracle

Author: fredericDelaporte

src/NHibernate.Test/PropertyRef/ManyToManyWithPropertyRef.hbm.xml

@@ -5,8 +5,8 @@
     <id name="Id">
       <generator class="native"/>
     </id>
-    <property name="Number"/>
-    <property name="Value"/>
+    <property name="Number" column="`Number`"/>
+    <property name="Value" column="`Value`"/>
     <bag name="ManyBs">
       <key column="ManyANumber" property-ref="Number"/>
       <many-to-many class="ManyB" column="ManyBNumber" property-ref="Number"/>
@@ -17,7 +17,7 @@
     <id name="Id">
       <generator class="native"/>
     </id>
-    <property name="Number"/>
-    <property name="Value"/>
+    <property name="Number" column="`Number`"/>
+    <property name="Value" column="`Value`"/>
   </class>
 </hibernate-mapping>