Unify options with gfio

Add the parser features and unify the option table.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/HOWTO b/HOWTO
index 76effee..eab53d2 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1241,6 +1241,7 @@
 lockmem=int	Pin down the specified amount of memory with mlock(2). Can
 		potentially be used instead of removing memory or booting
 		with less memory to simulate a smaller amount of memory.
+		The amount specified is per worker.
 
 exec_prerun=str	Before running this job, issue the command specified
 		through system(3).