The contents of command.c, creatinh.c, define.c, remove.c and rename.c

have been divided according to the type of object manipulated - so ALTER
TABLE code is in tablecmds.c, aggregate commands in aggregatecmds.c and
so on.

A few common support routines remain in define.c (prototypes in
src/include/commands/defrem.h).

No code has been changed except for includes to reflect the new files.
The prototypes for aggregatecmds.c, functioncmds.c, operatorcmds.c,
and typecmds.c remain in src/include/commands/defrem.h.

From John Gray <jgray@azuli.co.uk>

src/include/commands/portalcmds.h

@@ -0,0 +1,39 @@
+/*-------------------------------------------------------------------------
+ *
+ * portalcmds.h
+ *	  prototypes for portalcmds.c.
+ *
+ *
+ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: portalcmds.h,v 1.1 2002/04/15 05:22:03 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PORTALCMDS_H
+#define PORTALCMDS_H
+
+#include "utils/portal.h"
+
+/*
+ * PerformPortalFetch
+ *		Performs the POSTQUEL function FETCH.  Fetches count (or all if 0)
+ * tuples in portal with name in the forward direction iff goForward.
+ *
+ * Exceptions:
+ *		BadArg if forward invalid.
+ *		"ERROR" if portal not found.
+ */
+extern void PerformPortalFetch(char *name, bool forward, int count,
+							   CommandDest dest, char *completionTag);
+
+/*
+ * PerformPortalClose
+ *		Performs the POSTQUEL function CLOSE.
+ */
+extern void PerformPortalClose(char *name, CommandDest dest);
+
+extern void PortalCleanup(Portal portal);
+
+#endif  /* PORTALCMDS_H */