This patch adds the option to share the search/replace
history between sessions. Coming from the windows editor
Textpad, I really missed this feature all the past years.
The history file is updated on each new search/replace and
is checked on opening the find- or replace-dialog box.
It can be switched on/off through the preferences-menu
(Preferences -> Default Settings -> Searching -> Save History).
The patch is against the cvs version from 2008-12-04.