Some UI tweaks and fixes
* fixed some overlapping buttons (Matt, feel free to change button arrangement if you like), the Bookmark (B) button should probably be removed eventually from the current place and the fsmenu button as well, now that we have the directories on the left panel.
* fixed initialisation of params->display
(aligorith: thanks for fixing, I did reset the #defines, since it was just missing the correct value in the initialisation)
* fixed bug when area became too small (crash)
* fixed bug (last file missing in long display)
* fixed selection when mouse outside tiles.
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