Rip out table expression section from SQL syntax chapter and develop it

into new chapter on query (SELECT) syntax.  In the end this should become
a narrative and example-filled counterpart to the SELECT reference page.

doc/src/sgml/filelist.sgml

-<!-- $Header: /cvsroot/pgsql/doc/src/sgml/filelist.sgml,v 1.4 2001/01/06 11:58:56 petere Exp $ -->
+<!-- $Header: /cvsroot/pgsql/doc/src/sgml/filelist.sgml,v 1.5 2001/01/22 23:34:32 petere Exp $ -->
 
 <!entity about      SYSTEM "about.sgml">
 <!entity history    SYSTEM "history.sgml">
@@ -31,7 +31,7 @@
 <!entity plsql      SYSTEM "plsql.sgml">
 <!entity pltcl      SYSTEM "pltcl.sgml">
 <!entity psql       SYSTEM "psql.sgml">
-<!entity query-ug   SYSTEM "query-ug.sgml">
+<!entity queries    SYSTEM "queries.sgml">
 <!entity storage    SYSTEM "storage.sgml">
 <!entity syntax     SYSTEM "syntax.sgml">
 <!entity typeconv   SYSTEM "typeconv.sgml">

doc/src/sgml/user.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/Attic/user.sgml,v 1.24 2001/01/13 23:58:55 petere Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/Attic/user.sgml,v 1.25 2001/01/22 23:34:33 petere Exp $
 -->
 
 <book id="user">
@@ -44,6 +44,7 @@ $Header: /cvsroot/pgsql/doc/src/sgml/Attic/user.sgml,v 1.24 2001/01/13 23:58:55
 
  &intro;
  &syntax;
+ &queries;
  &datatype;
  &func;
  &typeconv;