* HttpSessionState.cs: Make the SessionDictionary accessable

    * HttpSessionState.cs: Make the SessionDictionary accessable
	* ISessionHandler.cs: Add method to update the session state
	data in the handler. Pass the session config to handlers when
	initializing.
	* SessionConfig.cs: Add StateNetworkTimeout
	* SessionInProcHandler.cs: Updates because interface has
	changed, all functionality is the same.
	* SessionStateModule.cs: Get new config items, allow SQLServer
	session manager type. Update session handlers when the session
	state has been released.
	* SessionStateSectionHandler.cs: Add StateNetworkTimeout
	* SessionSQLServerHandler.cs: New class allows sessions to be
	stored in a database.

svn path=/trunk/mcs/; revision=19596