Add a boolean GUC parameter "bonjour" to control whether a Bonjour-enabled

build actually attempts to advertise itself via Bonjour.  Formerly it always
did so, which meant that packagers had to decide for their users whether
this behavior was wanted or not.  The default is "off" to be on the safe
side, though this represents a change in the default behavior of a
Bonjour-enabled build.  Per discussion.

doc/src/sgml/config.sgml

@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.224 2009/08/24 20:08:31 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.225 2009/09/08 17:08:36 tgl Exp $ -->
 
 <chapter Id="runtime-config">
   <title>Server Configuration</title>
@@ -472,6 +472,20 @@ SET ENABLE_SEQSCAN TO OFF;
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-bonjour" xreflabel="bonjour">
+      <term><varname>bonjour</varname> (<type>boolean</type>)</term>
+      <indexterm>
+       <primary><varname>bonjour</> configuration parameter</primary>
+      </indexterm>
+      <listitem>
+       <para>
+        Enables advertising the server's existence via
+        <productname>Bonjour</productname>.  The default is off.
+        This parameter can only be set at server start.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-bonjour-name" xreflabel="bonjour_name">
       <term><varname>bonjour_name</varname> (<type>string</type>)</term>
       <indexterm>
@@ -479,7 +493,7 @@ SET ENABLE_SEQSCAN TO OFF;
       </indexterm>
       <listitem>
        <para>
-        Specifies the <productname>Bonjour</productname> broadcast
+        Specifies the <productname>Bonjour</productname> service
         name.  The computer name is used if this parameter is set to the
         empty string <literal>''</> (which is the default).  This parameter is
         ignored if the server was not compiled with