Move test scripts from nightlybuild.sh to separate files

The test scripts are now in nightly/tests/TURN/PLAYER.  For each turn,
the update script is executed first (except for turn 00), and then all
the player scripts in the appropriate turn directory.  This runs
runfeed() in different directories; change it to accomodate for that.

The update script runs "report *" on all updates.  Before, it ran only
on some of them.

src/scripts/nightly/common.sh

@@ -29,6 +29,6 @@ runfeed() {
 	[ -n "$REP" ] || REP="$1"
 	{
 		cat
-	} | ../bin/empire "$1" "$REP" || { warn "empire not ok ?" ; return 1 ; }
+	} | ${EMPIRE_PATH}/empire "$1" "$REP" || { warn "empire not ok ?" ; return 1 ; }
 	return 0
 }