* src/GrampsDb/_WriteGedcom.py: Multiple improvements.

* various: Replace get/set_base_handle with get/set_reference_handle.
	* src/RelLib/_SourceRef.py (get_base_handle,set_base_handle):
	Remove redundant methods.


svn: r6750

src/ObjectSelector/_PersonPreviewFrame.py

@@ -122,7 +122,7 @@ class PersonPreviewFrame(PreviewFrameBase):
 
         if len(person.get_source_references()) > 0:
             psrc_ref = person.get_source_references()[0]
-            psrc_id = psrc_ref.get_base_handle()
+            psrc_id = psrc_ref.get_reference_handle()
             psrc = self._dbstate.db.get_source_from_handle(psrc_id)
 
             s += "\n<span weight=\"bold\">%s</span>\n"\