Remove deleted / moved pages from recent pages pathbar

Renaming a page yields non-intuitive results since Zim does not clean up //History bar// or //Home Page// entries in configuration files.

1. Assumption: When I open a page and rename or delete it, references to that page in the History bar should also be renamed or deleted. Otherwise, the history bar refers to a non-existent page. Clicking on that button in the History bar displays a page that I though I had gotten rid of.

Specifically, the 'Home' item should be deleted from:

 .zim/state.conf:
 [History]
 history=[Home, ...]

2. Assumption: When I rename the Home page for a notebook, the home page associated with the notebook should also change. (Or a warning message should be issued when the page is renamed informing me that I need to change menu item file/properties/Home Page to the new name.)

Specifically, the value for 'home' in notebook.zim should be changed to the new name:
 notebook.zim:
 [Notebook]
 home=Home
================================================================================================
Linux version 2.6.31-17-generic (buildd@palmer) (gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu8) ) #54-Ubuntu SMP Thu Dec 10 16:20:31 UTC 2009

gtkversion.h:
     #define GTK_MAJOR_VERSION (2)
     #define GTK_MINOR_VERSION (18)
     #define GTK_MICRO_VERSION (3)
     #define GTK_BINARY_AGE (1803)
     #define GTK_INTERFACE_AGE (3)

pygtk._get_available_versions(): {'2.0': '/usr/lib/python2.6/dist-packages/gtk-2.0'}

INFO: This is zim 0.42
DEBUG: Python version is (2, 6, 4, 'final', 0)
DEBUG: Zim revision is:
 branch: pyzim-trunk
 revision: 181 <email address hidden>
 date: 2010-01-10 23:00:57 +0100

DEBUG: Running from a source dir: /opt/download/python_packages/zim-0.42
DEBUG: Set XDG_DATA_HOME to /home/USERNAME/.local/share
DEBUG: Set XDG_DATA_DIRS to [<Dir: /opt/download/python_packages/zim-0.42>, <Dir: /usr/local/share>, <Dir: /usr/share>]
DEBUG: Set XDG_CONFIG_HOME to /home/USERNAME/.config
DEBUG: Set XDG_CONFIG_DIRS to [<Dir: /etc/xdg>]
DEBUG: Set XDG_CACHE_HOME to /home/USERNAME/.cache
DEBUG: Running command: gui
DEBUG: Cache dir: /home/USERNAME/data/zim/.zim
DEBUG: Index database file: /home/USERNAME/data/zim/.zim/index.db
TODO: hook slow_fs property
INFO: Opening default notebook
DEBUG: Sending to daemon: ["ping",[],{}]

DEBUG: Daemon replied: "Ack"
DEBUG: Sending to daemon: ["vivicate",["zim.gui.GtkInterface","file:///home/USERNAME/data/zim"],{"usedaemon":true,"notebook":"file:///home/USERNAME/data/zim"}]

DEBUG: Daemon replied: true
DEBUG: Sending to daemon: ["relay",[["zim.gui.GtkInterface","file:///home/USERNAME/data/zim"],"present",null],{"geometry":null,"fullscreen":null}]

DEBUG: Daemon replied: true