build_menu functions; (build_backhistmenu, build_fwdhistmenu): Use
event for popping the menu.
* NEWS, TODO: catch up with the current CVS state.
* src/Utils.py (history_broken, clearHistory_broken, wasHistory_broken):
Add functions.
* src/plugins/ReorderIds.py(__init__): Call Utils.history_broken upon
reordering.
* src/gramps_main.py (clear_history): Add function;
(redraw_histmenu, fwd_clicked, back_clicked): Clear history if catching
an exception (should be actually handled by reorder plugin, leaving here
svn: r2320
