Updates to the (still only sort of working) history playlist.
Added new virtual methods to Playlist -- readOnly() and columnOffset(). columnOffset() indicates the position at which the Playlist class can expect to find the standard set of columns. This let me add a "time" column to the history playlist. I adjusted the code in other places to use these two new methods. Also allow the history playlist to have multiple copies of the same item; this is still buggy at the moment since this API feature hadn't yet been used. svn path=/trunk/kdemultimedia/juk/; revision=241800
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