Update Arguments and Facts

Fixes #1286806 [Updated recipe for arguments and facts](https://bugs.launchpad.net/calibre/+bug/1286806)
DJVU Input: When extracting embedded txt from TXTz sections in DJVU files, fix incorrect extraction of txt when the djvutxt external program is not present. Fixes #1286771 [converting DJVU file containing text fails](https://bugs.launchpad.net/calibre/+bug/1286771)
Some performance improvements for BZZDecoder
DJVU Input: A fast C based decompressor for DJVU files