Fix circular dependency jsled introduced.

[Derek Atkins]

Log Message:
-----------
Fix circular dependency jsled introduced.

	* configure.in: add support for gtkhtml-3.1, remove src/experimental
	* src/Makefile.am: remove experimental subtree
	* src/app-file/gncmod-app-file.c: don't need gnc-mdi-utils.h
	* src/gnome/gnc-window.c: register the gnc-mdi progress handler
	* src/gnome-utils/gnc-mdi-utils.[ch]: add a progress handler
	  that gets set by the gnc-window code (just like in gnc-file)
	  to remove a circular dependency.

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
        configure.in
    gnucash/src:
        Makefile.am
    gnucash/src/app-file:
        gncmod-app-file.c
    gnucash/src/gnome:
        gnc-window.c
    gnucash/src/gnome-utils:
        gnc-mdi-utils.c
        gnc-mdi-utils.h