Emutastic for Linux 0.9.6

What's Fixed

• ScreenScraper login — 0.9.3 shipped without the developer registration the ScreenScraper API requires, so every request was refused before it ever reached your account. Logging in with a correct username and password works again.
• Misleading login error — a refused developer registration reported itself as "Incorrect ScreenScraper username or password", sending people off to reset a password that was never wrong. Each failure is now named for what actually went wrong, and the artwork and metadata scrapers record the reason instead of quietly returning no results.
• BIOS kept in folders — dropping a folder onto System Files imported nothing and reported "No BIOS files recognized", and a pack unpacked into a subfolder of the System folder was never picked up at all; only the exact layout the emulators read was ever checked. Both work now: a dropped folder is searched all the way down, and the System folder's own subfolders are swept on every scan. Recognized dumps are copied into place, and the originals are left where they are.