Remove unused $g_hr_size and $g_hr_width config options

These 2 configs were removed from the code several years ago (see commit
6a0714f), but their definition remained
in config_defaults_inc.php and the documentation (admin guide).

config_defaults_inc.php

@@ -1804,22 +1804,6 @@
  */
 $g_wrap_in_preformatted_text = ON;
 
-########################
-# MantisBT HR Settings #
-########################
-
-/**
- * Horizontal Rule Size
- * @global integer $g_hr_size
- */
-$g_hr_size = 1;
-
-/**
- * Horizontal Rule Width
- * @global integer $g_hr_width
- */
-$g_hr_width = 50;
-
 #############################################
 # MantisBT Authentication and LDAP Settings #
 #############################################

core/obsolete.php

@@ -193,3 +193,5 @@
 config_obsolete( 'email_set_category' );
 config_obsolete( 'font_per_captcha' );
 config_obsolete( 'csv_add_bom' );
+config_obsolete( 'hr_size' );
+config_obsolete( 'hr_width' );

docbook/Admin_Guide/en-US/config/html.xml

@@ -15,22 +15,10 @@
 					is. The $g_allow_href_tags does not have to be enabled to make URL
 					links. The package will automatically hyperlink properly formatted
 					URLs eg. http://blah.blah/ or
-					mailto://me@more.com/ 
+					mailto://me@more.com/
 				</para>
 			</listitem>
 		</varlistentry>
-		<varlistentry>
-			<term>$g_hr_size</term>
-			<listitem>
-				<para>hr size.</para>
-			</listitem>
-		</varlistentry>
-		<varlistentry>
-			<term>$g_hr_width</term>
-			<listitem>
-				<para>hr width. Leave off the percentage (%) symbol.</para>
-			</listitem>
-		</varlistentry>
 		<varlistentry>
 			<term>$g_bottom_include_page</term>
 			<listitem>