** buffer-substring now runs the hook buffer-access-fontify-functions,<BR>
calling each function with two arguments--the range of the buffer
being accessed.  buffer-substring-no-properties does not call them.
<P>
If you use this feature, you should set the variable
buffer-access-fontified-property to a non-nil symbol, which is a
property name.  Then, if all the characters in the buffer range have a
non-nil value for that property, the buffer-access-fontify-functions
are not called.  When called, these functions should put a non-nil
property on the text that they fontify, so that they won't get called
over and over for the same text.
<P>