Chris Shoemaker's patch: * Fix memory leak of xml parser context in

[Derek Atkins]

Log Message:
-----------
	Chris Shoemaker's patch:
	* Fix memory leak of xml parser context in sixtp-stack.c, string in
	  gnc_plugin_file_history, gdkCursor in cursors.c, GtkIconSources in
	  gnc-icons.c, several strings in gnc-menu-extensions.c, TimeSpec and
	  strings in test-engine-stuff.c
	* added some constness to gnc_ext_gen_action_name()

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/backend/file:
        sixtp-stack.c
        sixtp.c
    gnucash/src/engine/test-core:
        test-engine-stuff.c
    gnucash/src/gnome:
        gnc-plugin-file-history.c
    gnucash/src/gnome-utils:
        cursors.c
        gnc-icons.c
        gnc-menu-extensions.c