Changes for branch openafs-stable-1_8_x.

numbersubjecttopic
13651afs: remove bogus comment from afs_IsTokenExpired
13650afs: add a file-level comment to afs_osidnlc.c
13643Update NEWS for 1.8.4pre1
13639pioctl: limit fruitless token searches
13638Fix static expressions in conditionals
13596Make OpenAFS 1.8.4pre1stage-1_8_4pre4