zap some wacky Eo/Ec stuff, and start sentences on new lines; ok schwarze
add some missing .An macros and remove some obsolete .Tn
When listing the async-signal-safe functions, don't split out "ANSI C"
functions; the concept comes from POSIX anyway.

With tweaks from schwarze@
ok deraadt@, jmc@, millert@, schwarze@