uftpd v2.2

Changes

• Sort directories first in FTP LIST command
• Make sure to exit all lingering FTP sessions on exit
• Logging: reduced verbosity of common FTP commands
• Logging: show client address on failed file retrieval
• Full Debian/Ubuntu .deb build support, including debconf,
  asking user what services (FTP and/or TFTP) to run.
• Verify FTP/TFTP root directory is not writable by default
• New option to allow writable FTP/TFTP root, disabled by default

Fixes

• Fix FTP directory listings, was off-by-one, one entry missing
• Issue #7: Spelling error in README.md
• Issue #8: Install missing symlinks for in.ftpd.8 and in.tftpd.8