Patch for compressor history undo/redo

Hi,

Here is the compressor history undo/redo final patch. I think it is
stable. Please, give it a try.

----------
-> "jam-ui.glade" file has changed, so you must reedit it with Glade and
rebuild the project before building the application.

-> "callbacks.[h,c]" has changed.

-> "mk-stateh.pl" file has changed.
----------

If you accept to commit this patch I will continue working on a history
undo/redo management for the equalizer. It seems to be harder to well
managed it, but I will try.

Bye

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