FS#11473 - New bookmarking option: one per track
This patch implements the idea proposed and discussed in http://forums.rockbox.org/index.php?topic=24952.0
It adds a new option of how to create and maintain the list of the recent bookmarks (MRB): one per track. With this option, if a bookmark is added to the MRB, other bookmarks from the same playlist and the same track are not retained.
Comments are welcome.
I think it would be good if we could introduce such option for "normal" bookmark files too, i.e. to store only one bookmark per track in a bookmark list. But this would be matter of a separate patch.
This task depends upon