Toggle showing average depth

Add additional check box in "preferences->graph" section that allows
users to hide average depth on dive profile.
By default this option is checked to show average depth.

Fixes #475

Signed-off-by: Lakshman Anumolu <acrlakshman@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/pref.h b/pref.h
index 3955b88d7..ec2aab2a9 100644
--- a/pref.h
+++ b/pref.h
@@ -39,6 +39,7 @@ struct preferences {
 	struct units units;
 	short show_sac;
 	bool display_unused_tanks;
+	bool show_average_depth;
 	bool zoomed_plot;
 	bool text_label_with_units;
 };