Add dive tags and support invalid dives

This started out as a way to keep dives in the dive list but being able to
mark them as 'invalid' so they wouldn't be visible (with an option to
disable that feature).

Now it supports an (at this point, fixed) set of tags that can be assigned
to a dive with 'invalid' being just one of them (but one that is special
as it gets some additional support for hiding such dive and marking dives
as (in)valid from the divelist).

[Dirk Hohndel: merged with the latest code and minor changes for coding
	       style and consistency. Ensure divelist is marked as
	       modified when changing 'invalid' tag]

Signed-Off-By: Jozef Ivanecký (dodo.sk@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 60fe1104c..3c6b43c70 100644
--- a/pref.h
+++ b/pref.h
@@ -36,6 +36,7 @@ struct preferences {
 	int map_provider;
 	const char *divelist_font;
 	const char *default_filename;
+        short display_invalid_dives;
 };
 
 extern struct preferences prefs, default_prefs;