Remove tabs from SGML reference files, so their addition can be detected

in the future.

doc/src/sgml/ref/clusterdb.sgml

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-$PostgreSQL: pgsql/doc/src/sgml/ref/clusterdb.sgml,v 1.19 2007/02/20 18:10:58 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/clusterdb.sgml,v 1.20 2007/02/21 23:21:11 momjian Exp $
 PostgreSQL documentation
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doc/src/sgml/ref/dropdb.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/dropdb.sgml,v 1.29 2007/02/20 18:10:58 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/dropdb.sgml,v 1.30 2007/02/21 23:21:11 momjian Exp $
 PostgreSQL documentation
 -->
 

doc/src/sgml/ref/droplang.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/droplang.sgml,v 1.28 2007/02/20 18:10:58 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/droplang.sgml,v 1.29 2007/02/21 23:21:11 momjian Exp $
 PostgreSQL documentation
 -->
 

doc/src/sgml/ref/initdb.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/initdb.sgml,v 1.41 2007/02/20 18:10:58 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/initdb.sgml,v 1.42 2007/02/21 23:21:11 momjian Exp $
 PostgreSQL documentation
 -->
 

doc/src/sgml/ref/pg_ctl-ref.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/pg_ctl-ref.sgml,v 1.39 2007/02/20 18:10:58 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/pg_ctl-ref.sgml,v 1.40 2007/02/21 23:21:11 momjian Exp $
 PostgreSQL documentation
 -->
 

doc/src/sgml/ref/pg_dumpall.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dumpall.sgml,v 1.66 2007/02/20 18:10:58 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dumpall.sgml,v 1.67 2007/02/21 23:21:12 momjian Exp $
 PostgreSQL documentation
 -->
 

doc/src/sgml/ref/psql-ref.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/psql-ref.sgml,v 1.184 2007/02/20 18:10:58 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/psql-ref.sgml,v 1.185 2007/02/21 23:21:12 momjian Exp $
 PostgreSQL documentation
 -->