Added two new conversion specifications.

Doc/tools/sgmlconv/conversion.xml

@@ -190,6 +190,9 @@
     </environment>
 
   <!-- "See also:" sections. -->
+  <environment name="seealso*" outputname="seealso">
+    <attribute name="sidebar">no</attribute>
+    </environment>
   <macro name="seemodule">
     <!-- this causes the optional parameter to \seemodule to be
          discarded -->
@@ -822,6 +825,10 @@
     <content/>
     </macro>
 
+  <macro name="leftline" outputname="">
+    <content/>
+    </macro>
+
   <!-- Conversions to text; perhaps could be different?  There's -->
   <!-- no way for a style sheet to work with these this way.	 -->
   <macro name="ABC" outputname="">