NAME
	IsFileSystem -- returns whether a Dos handler is a filesystem (V36)

   SYNOPSIS
	result = IsFileSystem(name)
	D0                     D1

	BOOL IsFileSystem(STRPTR)

   FUNCTION
	Returns whether the device is a filesystem or not.  A filesystem
	supports seperate files storing information.  It may also support
	sub-directories, but is not required to.  If the filesystem doesn't
	support this new packet, IsFileSystem() will use Lock(":",...) as
	an indicator.

   INPUTS
	name   - Name of device in question, with trailing ':'.

   RESULT
	result - Flag to indicate if device is a file system

   SEE ALSO
	Lock()