lots of changes - please read as this may break your build

[Henrik Brautaset Aronsen]

Dirk Hohndel wrote:
> Please take a look and test to make sure I didn't break anything while
> merging these changes.

Hi Dirk.

The device selector is missing the device subtype in the download 
dialogue, and when I exit the dialogue, Subsurface crashes:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff950c0212 __pthread_kill + 10
1   libsystem_c.dylib             	0x00007fff94898af4 pthread_kill + 90
2   libsystem_c.dylib             	0x00007fff948dcdce abort + 143
3   libglib-2.0.0.dylib           	0x000000010fde6ebf 
g_assertion_message + 303
4   libglib-2.0.0.dylib           	0x000000010fde7335 
g_assertion_message_expr + 69
5   libgtk-quartz-2.0.0.dylib     	0x000000010f5a3f12 
gtk_tree_store_get_path + 194
6   libgtk-quartz-2.0.0.dylib     	0x000000010f5a22cb 
gtk_tree_selection_iter_is_selected + 187
7   subsurface                    	0x000000010f0ccf4f check_selection_cb 
+ 127
8   libglib-2.0.0.dylib           	0x000000010fdc2edd g_list_foreach + 45
9   subsurface                    	0x000000010f0cd003 selection_cb + 67
10  libgobject-2.0.0.dylib        	0x000000010fd45f75 
_g_closure_invoke_va + 309
11  libgobject-2.0.0.dylib        	0x000000010fd56338 
g_signal_emit_valist + 1352
12  libgobject-2.0.0.dylib        	0x000000010fd56f06 
g_signal_emit_by_name + 678
13  libgtk-quartz-2.0.0.dylib     	0x000000010f5acc79 
gtk_tree_view_row_deleted + 745
14  libgobject-2.0.0.dylib        	0x000000010fd46104 g_closure_invoke + 308
15  libgobject-2.0.0.dylib        	0x000000010fd55859 
signal_emit_unlocked_R + 1641
16  libgobject-2.0.0.dylib        	0x000000010fd5695c 
g_signal_emit_valist + 2924
17  libgobject-2.0.0.dylib        	0x000000010fd56f84 g_signal_emit + 116
18  libgtk-quartz-2.0.0.dylib     	0x000000010f5a4d34 
gtk_tree_store_remove + 244
19  libgtk-quartz-2.0.0.dylib     	0x000000010f5a5e92 
gtk_tree_store_clear_traverse + 82
20  libgtk-quartz-2.0.0.dylib     	0x000000010f5a5e6c 
gtk_tree_store_clear_traverse + 44
21  libgtk-quartz-2.0.0.dylib     	0x000000010f5a5dfb 
gtk_tree_store_clear + 59
22  subsurface                    	0x000000010f0d0163 
dive_list_update_dives + 35
23  subsurface                    	0x000000010f0b6031 report_dives + 513
24  subsurface                    	0x000000010f0eefe9 download_dialog + 1961
25  libgobject-2.0.0.dylib        	0x000000010fd46104 g_closure_invoke + 308

Cheers,
Henrik