Add new man pages for pts interactive, quit, sleep, and source. Fix POD
errors in a few other man pages and update the to-do list in README.
(cherry picked from commit 87efbab4e8c0dc37c1938503eea88f7f319b7e5d)
Add a new fs newalias man page. Add -help to the synopsis and options of
the other new man pages. Add additional missing links in the fs man page.
Fix some wording in the CellAlias man page.
(cherry picked from commit e7742db31f68acf2d227c13840e0a0ed9291d247)
Complete the documentation of the afsd flags and update a few things like
-settime and -nosettime. Add man pages for fs setcrypt, fs getcrypt, and
CellAlias. Based on work by Jason Edgecombe and then extensively edited,
so any errors I probably introduced.
(cherry picked from commit 8761673c608986d32bb858b26441b09c24f41696)
