* SerializationCodeGenerator.cs: Several fixes: generate valid names for

	* SerializationCodeGenerator.cs: Several fixes: generate valid names for
	  WriteRoot_ and ReadRoot_ methods. Cast result of ReadTypedPrimitive to
	  the adequate type. Set the default value of members that do have a default
	  value. Other minor fixes.
	* SoapReflectionImporter.cs, XmlReflectionImporter.cs: All maps must derive
	  from typeof(object) map, even those that have another base class.
	* XmlCustomFormatter.cs: Fixed generation of conversion from char to string.
	  It must serialize the char as number, not as character.
	* XmlSerializationReaderInterpreter.cs: Set the default value of members
	  that do have a default value.
	* XmlTypeMapping.cs: Added property MembersWithDefault, which returns a list
	  of members that have a default value.

svn path=/trunk/mcs/; revision=24540