This patch removes the old, broken htmlviewer used to display the help
pages.  Instead the new code attempts to find an appropriate help viewer
based on the OS and compatibility settings.  If one cannot be found, the
user is prompted.

2002-11-11  Martin M. Hunt  <hunt@redhat.com>	

	* library/helpviewer.tcl: New file. Finds
	an appropriate help browser and displays the help files.

	* library/vartree.itb: Fix open_help calls.
	
	* library/helpviewer.ith: Deleted.
	* library/helpviewer.itb: Deleted.
	
	* library/prefs.tcl (pref_set_defaults): Remove 
	pref gdb/help/browser. Add pref gdb/help/browsername.  
	We couldn't simply rename because it would break older 
	versions of Insight that expect gdb/help/browser to be 
	a number.