TAKE - Allow xfs_db to write negative numbers

[Eric Sandeen <sandeen@sgi.com>]

Allow xfs_db to write negative numbers.  "-1" is often a special value
for inode numbers, etc, but xfs_db didn't allow you to write a negative
number.

Date:  Tue Sep  3 09:53:43 PDT 2002
Workarea:  stout.americas.sgi.com:/localhome/src/sandeen/2.4.x-xfs/workarea-alwaysclean

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  xfs-cmds:slinx:126585a
cmd/xfsprogs/db/write.c - 1.6
cmd/xfsprogs/VERSION - 1.56
cmd/xfsprogs/doc/CHANGES - 1.81