pbzip2 1.1.2 released

Written for pbzip2 by Jeff Gilchrist on 2011-02-19

Bug-fix release. Most notable changes:
- Consumer_decompress throttling modified to prevent potential deadlock/infinite loop in certain situations (Thanks to Laszlo
  Ersek for finding and helping track down the cause of this bug)
- Fixed deadlock bug and performance issue when consumer working with long bzip2 sequences (Thanks to Tanguy Fautre for finding)
- Fixed bug which caused hang while decompressing prematurely truncated bzip2 stream
- Fixed hang on decompress of some truncated archives (bug #590225)
- Implemented --ignore-trailing-garbage feature (bug #594868)

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