Removed duplicate line
Added comments and a new public method to update the panel when data
changes.
Added the ability to temporarily disable file extension checking.
Added a list of banned file extensions, and a field to show if checking
was enabled or disabled.
Changed setup to reflect file extension enabling/disabling.
Added a dummy dataChanged method.
Added a dummy dataChanged method.
Made the intro image and the icon the same (looks much cooler). Added a
dummy dataChanged method.
Changed contentPane to private, activePanel to protected. Added a
boolen, banlistEnabled, to reflect current banlist enbabled state.
Removed SequentialFilesystemCopier, which contained only unused dev
code.