Consistenly lowercase GUC variable names, in docs and error messages.

doc/src/sgml/charset.sgml

-<!-- $Header: /cvsroot/pgsql/doc/src/sgml/charset.sgml,v 2.38 2003/08/31 17:32:18 petere Exp $ -->
+<!-- $Header: /cvsroot/pgsql/doc/src/sgml/charset.sgml,v 2.39 2003/09/11 18:30:38 momjian Exp $ -->
 
 <chapter id="charset">
  <title>Localization</>
@@ -769,7 +769,7 @@ char *pg_encoding_to_char(int <replaceable>encoding_id</replaceable>);
 
       <listitem>
        <para>
-	Using <command>SET CLIENT_ENCODING TO</command>.
+	Using <command>SET client_encoding TO</command>.
 
 	Setting the client encoding can be done with this SQL command:
 
@@ -786,13 +786,13 @@ SET NAMES '<replaceable>value</>';
 	To query the current client encoding:
 
 <programlisting>
-SHOW CLIENT_ENCODING;
+SHOW client_encoding;
 </programlisting>
 
 	To return to the default encoding:
 
 <programlisting>
-RESET CLIENT_ENCODING;
+RESET client_encoding;
 </programlisting>
        </para>
       </listitem>

doc/src/sgml/func.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.171 2003/09/11 17:26:20 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.172 2003/09/11 18:30:38 momjian Exp $
 PostgreSQL documentation
 -->
 
@@ -3435,7 +3435,7 @@ substring('foobar' from 'o(.)b')   <lineannotation>o</lineannotation>
 
    <para>
     Normally the flavor of RE being used is determined by
-    <varname>REGEX_FLAVOR</>.
+    <varname>regex_flavor</>.
     However, this can be overridden by a <firstterm>director</> prefix.
     If an RE of any flavor begins with <literal>***:</>,
     the rest of the RE is taken as an ARE.
@@ -3762,7 +3762,7 @@ substring('foobar' from 'o(.)b')   <lineannotation>o</lineannotation>
 
     While these differences are unlikely to create a problem for most
     applications, you can avoid them if necessary by
-    setting <varname>REGEX_FLAVOR</> to <literal>extended</>.
+    setting <varname>regex_flavor</> to <literal>extended</>.
    </para>
    </sect3>
 

doc/src/sgml/perform.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/perform.sgml,v 1.32 2003/09/11 17:31:45 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/perform.sgml,v 1.33 2003/09/11 18:30:38 momjian Exp $
 -->
 
  <chapter id="performance-tips">
@@ -603,7 +603,7 @@ SELECT * FROM a, b, c WHERE a.id = b.id AND b.ref = c.id;
    <productname>PostgreSQL</productname> planner will switch from exhaustive
    search to a <firstterm>genetic</firstterm> probabilistic search
    through a limited number of possibilities.  (The switch-over threshold is
-   set by the <varname>GEQO_THRESHOLD</varname> run-time
+   set by the <varname>geqo_threshold</varname> run-time
    parameter.)
    The genetic search takes less time, but it won't
    necessarily find the best possible plan.

doc/src/sgml/plpgsql.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/plpgsql.sgml,v 1.23 2003/09/11 17:31:45 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/plpgsql.sgml,v 1.24 2003/09/11 18:30:38 momjian Exp $
 -->
 
 <chapter id="plpgsql"> 
@@ -1350,7 +1350,7 @@ SELECT * FROM some_func();
        allow users to allow users to define set-returning functions
        that do not have this limitation.  Currently, the point at
        which data begins being written to disk is controlled by the
-       <varname>SORT_MEM</> configuration variable.  Administrators
+       <varname>sort_mem</> configuration variable.  Administrators
        who have sufficient memory to store larger result sets in
        memory should consider increasing this parameter.
       </para>

src/backend/postmaster/postmaster.c

@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.343 2003/09/04 03:38:55 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.344 2003/09/11 18:30:39 momjian Exp $
  *
  * NOTES
  *
@@ -2609,7 +2609,7 @@ sigusr1_handler(SIGNAL_ARGS)
 					ereport(LOG,
 							(errmsg("checkpoints are occurring too frequently (%d seconds apart)",
 									elapsed_secs),
-					errhint("Consider increasing CHECKPOINT_SEGMENTS.")));
+					errhint("Consider increasing 'checkpoint_segments'.")));
 			}
 			LastSignalledCheckpoint = now;
 		}

src/backend/utils/misc/guc.c

@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.156 2003/09/07 15:26:53 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.157 2003/09/11 18:30:39 momjian Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -1311,7 +1311,7 @@ static struct config_string ConfigureNamesString[] =
 	{
 		{"log_error_verbosity", PGC_SUSET, LOGGING_WHEN,
 			gettext_noop("Controls verbosity of logged messages"),
-			gettext_noop("Valid values are TERSE, DEFAULT, and VERBOSE")
+			gettext_noop("Valid values are 'terse', 'default', and 'verbose'")
 		},
 		&log_error_verbosity_str,
 		"default", assign_log_error_verbosity, NULL