• wrote framework for per-mime zoom options--mimes now have separate show actions for the media viewer and the preview window and zoom in to fit
• added 'half/double zoom' to limit a mime's zoom to only 25%, 50%, 100%, 200%, 400% and so on (png defaults to this)
• added placeholders for zoom in/out algorithm quality, but they don't do anything yet
• added a listctrl to edit all this to options->media
• added a scrappy zoom values option to options->media
• cleaned up a bunch of zoom code
• added video/mpeg support
• fixed some mime layout stuff
• duplicate tag predicates across the 'all known tags' space are merged into more accurate (3-5)-type counts
• refactored and simplified how predicate counts are merged
• if launched from the manage tags dialog, the advanced content update dialog now correctly filters hta imports to only the files the manage tags dialog was launched with
• the advanced content update dialog has a bit of better text to explain this
• in prep for a complete rewrite of the image rendering pipeline, merged the fullscreen and preview image caches and cleaned up some related code
• added resume recovery to the v215->v216 update code for users for whom this update was interrupted
• directory creation is improved across the program
• fixed the optimised merge-move file code, which was forgetting to clean up the source when no move was needed
• the optmised merge-move directory code will now be much quicker in some situations
• all file moves across the program should be less stupid-error prone, and repeating/resuming many maintenance or update tasks that require a lot of moves will be much faster
• manual exports, which use copy rather than move, should also be more sensible and faster when repeated
• improved database exception rendering, which in some cases was being truncated
• misc cleanup
• misc small updates to help