#8 Monitor bookmarks file instead of loading on menu showing

[Ed Catmur]

With a large bookmarks file, especially if $HOME is on
NFS, loading the bookmarks can take some time making
the bookmarks menu unresponsive.

This patch uses gnomevfs.monitor_add to reload
bookmarks when the bookmarks file changes, so the menu
is displayed instantly.

(It doesn't handle the user changing the default
browser or the mozilla profile; I could code that up if
you want.)

[Ed Catmur]

patch