backend flowchart.

Another PGINDENT run that changes variable indenting and case label indenting.  Also static variable indenting.

The following patches add to the backend a new debugging flag -K which prints
a debug trace of all locking operations on user relations (those with oid
greater than 20000). The code is compiled only if LOCK_MGR_DEBUG is defined,
so the patch should be harmless if not explicitly enabled.
I'm using the code to trace deadlock conditions caused by application queries
using the command "$POSTMASTER -D $PGDATA -o '-d 1 -K 1'.
The patches are for version 6.0 dated 970126.

	#include "postgres.h"
	#include "c.h"

	- centralizing to simplify the -I's required to compile