pgsql: Change the return value of HeapTupleSatisfiesUpdate() to be an

Log Message:
-----------
Change the return value of HeapTupleSatisfiesUpdate() to be an enum,
rather than an integer, and fix the associated fallout. From Alvaro
Herrera.

Modified Files:
--------------
pgsql/src/backend/access/heap:
heapam.c (r1.183 -> r1.184)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/heap/heapam.c.diff?r1=1.183&r2=1.184)
pgsql/src/backend/commands:
async.c (r1.119 -> r1.120)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/async.c.diff?r1=1.119&r2=1.120)
trigger.c (r1.177 -> r1.178)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/trigger.c.diff?r1=1.177&r2=1.178)
pgsql/src/backend/executor:
execMain.c (r1.242 -> r1.243)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execMain.c.diff?r1=1.242&r2=1.243)
pgsql/src/backend/utils/time:
tqual.c (r1.85 -> r1.86)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/time/tqual.c.diff?r1=1.85&r2=1.86)
pgsql/src/include/access:
heapam.h (r1.96 -> r1.97)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/heapam.h.diff?r1=1.96&r2=1.97)
pgsql/src/include/utils:
tqual.h (r1.55 -> r1.56)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/tqual.h.diff?r1=1.55&r2=1.56)