anchor.diff:  The bzr extractor is not very well tested as yet.
   
   When a git repo is actually a git-svn remote, this tool tries to do
  -the right thing and return a Subversion revision. The bug is that the
  +the right thing and return a Subversion revision.  The bug is that the
   detector code for this case is somewhat unreliable; you will get the
   hash instead if your configuration doesn't use svn-remote.svn.url.
   
  
positive.code: 
  *VCS_BRANCH*::
  The name of the branch of the commit graph that was selected when
  autoversion was run.  Under Subversion this will normally be either
  'trunk' or the basename of some branch or tag subdirectory, depending
  on where *autoversion* was run.  Under git, this will normally be the
  shortname of the current branch (the asterisked line in the output of
  of "git branch") except that when the branch doesn't have a shortname
  it will be a full refspec.  Under hg the feature that is called
  'branches' is actually a sort of graph coloring (multiple heads can
  have the same branch name) so this variable is filled with the current
  bookmark if it exists, with the current branch name as a fallback.{br}
  Under bzr, this is the nick of the branch you are on.
  
  *VCS_TAG*::
  
negative.code: 
  *VCS_WC_MODIFIED*::
  Set to `1` if the current working directory has been modified and `0`
  if not.  If the output language has native Boolean literals, true will
  mean modified and false unmodified.  The C/C++ output is left as
  numeric so the preprocessor can test it.{br}
  'Untracked files are not ignored; see *`-U`* for details.'
  
  == OPTIONS ==
  
  *-t* '<output-type>'::
  Sets the output type.  It is required unless *`-s`* is specified; both
  *`-t`* and *`-s`* cannot be used in the same invocation.
  
  *-s* '<symbol>'::
  Changes the reporting behavior; instead of emitting a symbol file to
  stdout, only the value of that individual symbol will be reported.  It
  is required unless *`-t`* is specified; both *`-t`* and *`-s`* cannot
  be used in the same invocation.
  
  