Log Message:
Update pstree to 2.27.  Changes:

 * Revision 2.27  2005-04-08 22:08:45+02  fred
   Also accept PPID==1 if nothing else is found. Should fix problem with
   FreeBSD and security.bsd.see_other_uids=0.

 * Revision 2.26  2004-10-15 13:59:03+02  fred
   Fixed small bug with char/int variable c
   reported by Tomas Dvorak <tomas_dvorak AT mailcan.com>

 * Revision 2.25  2004-05-14 16:41:39+02  fred
   Added workaround for spurious blank lines in ps output under AIX 5.2
   reported by Dean Rowswell <rowswell AT ca.ibm.com>

 * Revision 2.24  2004-04-14 09:10:29+02  fred
   *** empty log message ***

 * Revision 2.23  2004-02-16 10:55:20+01  fred
   Fix for zombies (pid == 0) under FreeBSD

 * Revision 2.22  2003-12-12 10:58:46+01  fred
   Added support for TRU64 v5.1b TruCluster

 * Revision 2.21  2003-10-06 13:55:47+02  fred
   Fixed SEGV under Linux when process table changes during run

 * Revision 2.20  2003-07-09 20:07:29+02  fred
   cosmetic

(Hint for updaters: the ChangeLog is at the bottom of the source file.)