Add pgtest script.

src/tools/pgtest

+:
+
+# This runs a build/initdb/regression test suite
+
+[ ! "$PGDATA" ] && echo "You must define PGDATA" 1>&2 && exit 1
+
+[ ! -d src ] && echo "This must be run from the top of the PostgreSQL source tree" 1>&2 && exit 1
+
+trap "rm -rf /tmp/$$" 0 1 2 3 15
+mkdir /tmp/$$
+TMP="/tmp/$$"
+
+pg_ctl stop
+rm -rf "$PGDATA"
+
+cd src
+
+# return command error value
+(gmake clean; gmake install 2>&1; echo "$?" > $TMP/ret) | 
+	(tee  $TMP/0; exit `cat $TMP/ret`) &&
+initdb &&
+pg_ctl start &&
+createdb test &&
+cd src/test/regress &&
+gmake clean &&
+gmake installcheck
+
+cat $TMP/0 | 
+	grep -v warning |
+	grep -v setproctitle | 
+	grep -v find_rule | 
+	grep -v yy_flex_realloc |
+	grep -v '\[javac\] [0-9]* warning'