Log Message:
Update xmess to 0.70.1.

Changes since  0.69.1 includes:
- Almost everything from MESS 0.70
- Fixed the default values for -sysinfo_file and -messinfo_file, which
  were missing a '/'.
- Fixed the handling of leading zeros in the fractional part of a float
  in src/unix/snprintf.c.  (Chris Kirmse)