List short and long versions of command-line arguments separately, and update some item descriptions

Original nano commit: 5088
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5088
Original nano commit message:
	Standardizing the formatting of command-line options -- each one separately.
Tweak formatting for command-line args in man page

Original nano commit: 5089
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5089
Original nano commit message:
	Tweaking the formatting of the man pages a bit
	so that po4a will create a nicer POT file.
Improve some formatting/wording for pinotrc man page

Original nano commit: 5090
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5090
Original nano commit message:
	Improving some of the wordings and formatting of the nanorc manpage.