Remove the logging-level datatype; support is now provided by the logging

component provided with zLOG.

doc/ZConfig/zconfig.tex

@@ -658,13 +658,6 @@ The following datatypes are provided by the default type registry.
   \function{locale.setlocale()} function.  Be aware that only the
   \code{'C'} locale is supported on some platforms.
 
-\term{\datatype{logging-level}}
-  A logging level usable by the \module{logging} package.  Valid
-  values are the names \code{critical}, \code{fatal}, \code{error},
-  \code{warn}, \code{info}, \code{debug}, and \code{all}, as well as
-  integers in the range [0..50].  Converted values are always
-  expressed as integers.
-
 \term{\datatype{null}}
   No conversion is performed; the value passed in is the value
   returned.  This is the default data type for section values.