Ensure that all <sect1> and <refentry> tags have IDs. This is needed

to ensure that the resulting webpages have predictable URLs, instead of
ever-changing numeric IDs.  The new contrib docs were the biggest
offender, but some old stuff had the problem too.  Also, rename a couple
of new contrib sgml files for consistency's sake.

doc/src/sgml/adminpack.sgml

@@ -1,5 +1,10 @@
-<sect1>
+<sect1 id="adminpack">
  <title>adminpack</title>
+ 
+ <indexterm zone="adminpack">
+  <primary>adminpack</primary>
+ </indexterm>
+
  <para>
   adminpack is a PostgreSQL standard module that implements a number of
   support functions which pgAdmin and other administration and management tools
@@ -29,4 +34,3 @@
  </sect2>
 
 </sect1>
-