Dive sites: prepare for dive site ref-counting

Add a dive site table to each dive site to keep track of dives
that have been added to a dive site. Add two functions to add
dives to / remove dives from dive sites.

Since dive sites now contain a dive table, the order of includes
had to be changed: "divesite.h" now includes "dive.h" and not
vice-versa. This caused some include churn.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

desktop-widgets/command_base.h

@@ -4,7 +4,7 @@
 #ifndef COMMAND_BASE_H
 #define COMMAND_BASE_H
 
-#include "core/dive.h"
+#include "core/divesite.h"
 
 #include <QUndoCommand>
 #include <QCoreApplication>	// For Q_DECLARE_TR_FUNCTIONS

desktop-widgets/divelogexportdialog.cpp

@@ -16,7 +16,7 @@
 #include "desktop-widgets/mainwindow.h"
 #include "profile-widget/profilewidget2.h"
 #include "core/save-profiledata.h"
-#include "core/dive.h"  // Allows access to helper functions in TeX export.
+#include "core/divesite.h"
 
 // Retrieves the current unit settings defined in the Subsurface preferences.
 #define GET_UNIT(name, field, f, t)           \

desktop-widgets/divelogimportdialog.cpp

@@ -11,6 +11,7 @@
 #include <QUndoStack>
 #include <QPainter>
 #include "core/qthelper.h"
+#include "core/divesite.h"
 #include "core/import-csv.h"
 
 static QString subsurface_mimedata = "subsurface/csvcolumns";

desktop-widgets/modeldelegates.cpp

@@ -14,6 +14,7 @@
 #include "qt-models/divetripmodel.h"
 #include "qt-models/divelocationmodel.h"
 #include "core/qthelper.h"
+#include "core/divesite.h"
 #include "desktop-widgets/simplewidgets.h"
 
 #include <QCompleter>

desktop-widgets/simplewidgets.cpp

@@ -13,6 +13,7 @@
 #include <QClipboard>
 
 #include "core/file.h"
+#include "core/divesite.h"
 #include "desktop-widgets/mainwindow.h"
 #include "core/qthelper.h"
 #include "libdivecomputer/parser.h"