misc: improved fast zipscanner some more
- quicker detection of fake zipfiles
- no lags when drag&drop big not-zipped files in "about"
- only allow 0 and 8 compression methods

misc: speedup for full-merged sets
misc: theoretical speedup for zipfiles with lots of entries
misc: some source cleanup

misc: "move not renamed sets to backup" is enabled by default

misc: renamed popupmenu item "view->Full Missing Set Output" to "Show All Missing Sets" and changed the behaviour a bit. If this flag is disabled you won't see any fully missing sets. This might become handy if you don't have all sets and don't want to see all messages about missing ones.

fixed: export datfile sometimes adds a "-" to the nodump flag

Roman Scherzer
ClrMamePro