TWiki::UI::View view command handler.
This method is designed to be
invoked via the TWiki::UI::run method.
Generate a complete HTML page that represents the viewed topics.
The view is controlled by CGI parameters as follows:
 rev  | 
			topic revision to view | 
 section  | 
			restrict view to a named section | 
 raw  | 
			no format body text if set | 
 skin  | 
			comma-separated list of skin(s) to use | 
 contenttype  | 
			Allows you to specify an alternate content type | 
viewfile command handler.
This method is designed to be
invoked via the TWiki::UI::run method.
Command handler for viewfile. View a file in the browser.
Some parameters are passed in CGI query:
 filename  | 
			Attachment to view | 
 rev  | 
			Revision to view |