'new_group' option

By default, jobs in a file are part of the same reporting group
unless seperated by a stone wall or if they define a group by
themselves (numjobs=x is used). Inserting a 'new_group' parameter
in a job description, will mark the start of a new reporting group.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/options.c b/options.c
index e7356f6..242a110 100644
--- a/options.c
+++ b/options.c
@@ -753,6 +753,12 @@
 		.help	= "Insert a hard barrier between this job and previous",
 	},
 	{
+		.name	= "new_group",
+		.type	= FIO_OPT_STR_SET,
+		.off1	= td_var_offset(new_group),
+		.help	= "Mark the start of a new group (for reporting)",
+	},
+	{
 		.name	= "thread",
 		.type	= FIO_OPT_STR_SET,
 		.off1	= td_var_offset(use_thread),