Log Message:
Changes 1.42:
* rewrote the entire configure.in/config.h.in to autoconf 2.57
  to be more consistent with normal autoconf'd programs.
  corrects bugs around packaging impediments and typos.

* improved privilege dropping code and added more options to
  configure to govern its behaviour

* added flag to turn off privilege revocation logic

* added multiline match as default and ability to enforce
  previous default single-line match (bugfix + feature)

* added ability to read bpf filter expression from file

* added ability to force the column width to a certain size

* added two new output modes: ``byline'', whose output
  respects embedded carriage returns (useful for http dumps),
  and ``none'', which prints out each dump as a single line no
   matter what.

* added ability to specify alternate nonprintable character
  (default is ``.'').

* made ``-q'' effects more consistent and usable for scenarios
  where ``-I'' and/or ``-O'' are being employed

* documentation updated