Decouple QofBook creation from QofSession.

So that we don't create two books when loading a session.
Step 1 to not having a dirty book when we think we should have no
book at all.

bindings/python/gnucash_core.i

@@ -224,4 +224,5 @@ char * no_args[1] = { NULL };
 gnc_engine_init(0, no_args);
 gnc_prefs_init();
 %}
-
+//We must explicitly declare this or it gets left out and we can't create books.
+QofBook* qof_book_new (void);

bindings/python/gnucash_core.py

@@ -103,7 +103,7 @@ class Session(GnuCashCoreClass):
         you don't need to cleanup and call end() and destroy(), that is handled
         for you, and the exception is raised.
         """
-        GnuCashCoreClass.__init__(self, instance=instance)
+        GnuCashCoreClass.__init__(self, Book())
         if book_uri is not None:
             try:
                 self.begin(book_uri, ignore_lock, is_new, force_new)

bindings/python/sqlite3test.c

@@ -24,12 +24,15 @@
 int main()
 {
     const char* testurl = "sqlite3://" TESTFILE;
+    char * no_args[1] = { NULL };
+    QofSession* s = NULL;
+    
     qof_log_init();
     qof_init();
     char * no_args[1] = { NULL };
     gnc_engine_init(0, no_args);
 
-    QofSession * s = qof_session_new();
+    s = qof_session_new(NULL);
     qof_session_begin(s, testurl, 0, 1, 0);
     qof_session_load(s, NULL);
     qof_session_save(s, NULL);