ome settings that
        are invalid for particular sessions (Alexey Klyukin)
       </P
><P
>        Previously, such not-valid-within-session values would cause all
        setting changes to be ignored by that session.
       </P
></LI
><LI
><P
>        Add an <TT
CLASS="LITERAL"
>include_if_exists</TT
> facility for configuration
        files (Greg Smith)
       </P
><P
>        This works the same as <TT
CLASS="LITERAL"
>include</TT
>, except that an error
        is not thrown if the file is missing