Update the man pages and generated text copies for nethack and recover.
I haven't looked at the other four (dlb, makedefs, dgn_comp, lev_comp).
recover's page referred to INSURANCE as being conditional, which is no
longer the case. nethack's page was missing a bunch of files to be
found in the playground and also a couple of environment variables.
I haven't read through the text of the page to try to see whether other
updates are warranted.
The generated text is wider than the previous copy (one or two space
right margin instead of 5 or so). I just used 'make nethack.txt' and
'make recover.txt' so don't know why that changed. (The older, wider
margin looks better, so if anyone knows how to fix this, please do.
And there's got to be a better way to force a blank line inside a
table than my <space><tab> hack.)
- as requested by ESR, remove the use of parentheses from the usage
summary, it confused some man page conversion tool he has
- updated documentation for the -p option to mention the word "role"
so anyone search for role in the man page will still find it
- removed use of .UC, it is listed as deprecated in all the current man
documentation I could find, when it was even documented at all
- other minor spelling and formatting (hyphenation) changes
