OS-1626 tar -C support on extract would be nice

*** 41,51 ****
  .fi
  
  .LP
  .nf
  \fBtar\fR x[BeFhilmnopqTvw@/[0-7]][fk][X...][j|J|z|Z] [\fItarfile\fR] [\fIsize\fR]
!      [\fIexclude-file\fR]... [\fIfile\fR]...
  .fi
  
  .SH DESCRIPTION
  .sp
  .LP
--- 41,51 ----
  .fi
  
  .LP
  .nf
  \fBtar\fR x[BeFhilmnopqTvw@/[0-7]][fk][X...][j|J|z|Z] [\fItarfile\fR] [\fIsize\fR]
!      [\fIexclude-file\fR]... [\(miC \fIdirectory\fR] [\fIfile\fR]...
  .fi
  
  .SH DESCRIPTION
  .sp
  .LP
*** 79,88 ****
--- 79,92 ----
  Performs a \fBchdir\fR (see \fBcd\fR(1)) operation on \fIdirectory\fR and
  performs the \fBc\fR (create) or \fBr\fR (replace) operation on \fIfile\fR. Use
  short relative path names for \fIfile\fR. If \fIfile\fR is "\fB\&.\fR", archive
  all files in \fIdirectory\fR. This operand enables archiving files from
  multiple directories not related by a close common parent.
+ .sp
+ This option may also be passed once to \fBx\fR (extract).  In this case the
+ program will \fBchdir\fR to \fIdirectory\fR after opening the archive, but
+ before extracting its contents.
  .RE
  
  .sp
  .ne 2
  .na