The NAME heading for man pages can't contain a space in the program side
or the man pages won't index with some man implementations.
(cherry picked from commit 6ef9f3933595e4fef5c4af334ab580dbb08212c3)
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)