Add Gtk dialog to select the dives tags for which dives are shown

This literally just creates the dialog and does not hook things up with
the dive list.

The idea is to abstract out the idea behind the invalid dives to allow the
user to select / deselect all kinds of dives and then do statistics on
the selected ones.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/dive.h b/dive.h
index 97fcd2a87..957415396 100644
--- a/dive.h
+++ b/dive.h
@@ -52,6 +52,7 @@
 #define DTAG_NR			19
 /* defined in statistics.c */
 extern char *dtag_names[DTAG_NR];
+extern int dtag_shown[DTAG_NR];
 
 /*
  * Some silly typedefs to make our units very explicit.