pbzip2 1.1.13 released

Written for pbzip2 by Jeff Gilchrist on 2016-01-09

Bugfix release:
- bug #1404812 add support for DESTDIR in Makefile (thanks to Ryan Schmidt)
- bug #1429181 fix bad CYGWIN define (thanks to Marco Atzeri)
- bug #1337949 rm unused vars; add hasInFile flag (thanks to Mingxing Zhang)
- bug #1524909 - output sometimes truncated on redirected -cd

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