Add preference setting determining the minimum number of chars for autocompletion. [#663671]

2011-11-10 Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* dialog-preferences.c (pref_tool_page_initializer): add
	gnm_conf_get_core_gui_editing_autocomplete_min_chars_node item

2011-11-10 Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* handle-conf-options (extra_attributes): add attributes for
	/apps/gnumeric/core/gui/editing/autocomplete-min-chars

2011-11-10 Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* schemas/org.gnome.gnumeric.gschema.xml.in.in
	(autocomplete-min-chars): new item
	* src/complete-sheet.c (complete_sheet_search_iteration): use
	gnm_conf_get_core_gui_editing_autocomplete_min_chars
	* src/gnumeric-conf.h
	(gnm_conf_get_core_gui_editing_autocomplete_min_chars_node): new
	(gnm_conf_get_core_gui_editing_autocomplete_min_chars): new
	(gnm_conf_set_core_gui_editing_autocomplete_min_chars): new
	* src/gnumeric-conf.c
	(gnm_conf_get_core_gui_editing_autocomplete_min_chars_node): new
	(gnm_conf_get_core_gui_editing_autocomplete_min_chars): new
	(gnm_conf_set_core_gui_editing_autocomplete_min_chars): new
	(watch_core_gui_editing_autocomplete_min_chars): new