btfs-2.18-bp151.3.1

- 2.18
  * Force DHT announce when bootstrap completes
  * Don't set file priority to 0 at start
  * Fix delete-on-unmount
  * Remove unneeded debug prints
  * Fix a potential null pointer deref
  * Silence warning on libtorrent 1.2

- 2.17
  * Adjust to libtorrent 1.2 API changes
    + Session flags changed type.
    + Remove flags changed type.
  * Silence warning about deprecated flags in libtorrent 1.2
  * Tweak configure.ac
  * Handle read_piece_alert errors
    + Fixes segfault, upstream bug #42
  * Set request timeout

- 2.16
  * Implement listxattr and getxattr
  * Return IS_BTFS xattr on all files and directories
  * Add btfsstat program

- 2.15
  * Adjust to libtorrent 1.2 API changes
    + Alert notification categories changed type
    + torrent_handle::status() parameter changed type
  * Set correct block usage
    (so tools like "du" report correct disk usage)
  * Implement statfs callback
    (so tools like "df" report torrent size and download progress)

- 2.14
  * Adjust to libtorrent API changes (add_dht_router deprecated)
  * Make it build with libtorrent 1.2 (drops support for 0.16)

- Initial commit, 2.13