* src/DisplayModels.py: fix source display

* src/GrampsBSDDB.py: add abort_changes task
* src/GrampsDbBase.py: add abort_changes task
* src/GrampsInMemDB.py: add abort_changes task
* src/Makefile.am: Add target to build documentation using epydoc
* src/gramps.glade: Add abandon changes menu item. Not fully implemented yet
* src/gramps_main.py: add exit_and_undo


svn: r3623

src/GrampsDbBase.py

@@ -128,6 +128,9 @@ class GrampsDbBase:
         """
         assert False, "Needs to be overridden in the derived class"
         
+    def abort_changes(self):
+        pass
+    
     def is_open(self):
         """
         Returns 1 if the database has been opened.
@@ -789,7 +792,7 @@ class GrampsDbBase:
         the state before the transaction was committed.
         """
         if self.undoindex == -1:
-            return
+            return False
         transaction = self.translist[self.undoindex]
 
         self.undoindex -= 1
@@ -834,7 +837,8 @@ class GrampsDbBase:
             else:
                 transaction = self.translist[self.undoindex]
                 self.undo_callback(_("_Undo %s") % transaction.get_description())
-
+        return True
+    
     def set_undo_callback(self,callback):
         """
         Defines the callback function that is called whenever an undo operation