* CodeIdentifier.cs: Fixed MakeValid method.

	* CodeIdentifier.cs: Fixed MakeValid method.
	* TypeTranslator.cs: Added support for more primitive types. Added
	  GetDefaultPrimitiveTypeData, which returns the type data to which a clr type
	  maps by default.
	* XmlCodeExporter.cs: Generate XmlRoot attribute only if root element name and ns
	  are different from the type ns and name.
	  Generate class and field comments.
	  Fixed default attribute generation. In elements with ref attribute, it has to be
	  generated in the referred attribute.
	* XmlReflectionImporter.cs: Added check: simple type extensions can't add new elements.
	  Added suport for text nodes in members of type "any".
	* XmlSchemaExporter.cs: Several fixes. Fixed generation of complex types with simple
	  content.
	* XmlSchemaImporter.cs: Several fixes. The importer now collects documentation info.
	* XmlSerializationWriter.cs: WriteNamespaceDeclarations(): do not declare namespaces
	  that have already been declared.
	  WriteStartElement(): elements from schema namespace are always written with ns prefix.
	* XmlTypeMapMember.cs: Added documentation property.
	* XmlTypeMapping.cs: Added documentation property. Added property to check if a class map
	  represents a simple type.

svn path=/trunk/mcs/; revision=17175