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When the user wants to get a backtrace, the crash handler shouldn't
kick in.

Also remove two notes that are obsolete by now.

This makes the names of these bindable functions equal to the names of
their corresponding options -- like for all the other toggles that have
a corresponding option.

This makes the line-numbers toggle rebindable, like all the others.

Make them smaller to make them sound less like shouting.

This kind of addresses https://savannah.gnu.org/bugs/?53310.

And remove a detail that is untrue when 'set selectedcolor' is used.

This fixes https://savannah.gnu.org/bugs/?53225.

The new option 'set errorcolor' allows the user to specify the color
combination for the status bar when an error message is displayed.

This addresses https://savannah.gnu.org/bugs/?48992.

This brings it in line with the other three "flip" toggles.

After commit e739448c, macros should work also when ncurses produces
escape sequences instead of keycodes.

And reword some things about translations and Unicode support.

The option now causes nano to trim trailing whitespace also when
hardwrapping occurs while the user is typing.

If the user uses a single version of nano, they have no need for
--quiet.  If they do sometimes use an older version and don't want
to see the warnings, they can use 2>/dev/null (they could make an
alias for that and put it before the call of nano).

List "browser", "pageup" and "pagedown" in the manuals; the first
because it matches "speller", and the latter two because they are
what these functions are commonly known by.  The names "tofiles",
"prevpage" and "nextpage" are now undocumented, but they are still
recognized by the code, as they match the tags for these functions.

^S will be the first thing people will try for saving a file,
and ^Q is somewhat mnemonic because it is to the left of ^W:
it searches backward.

Make these keystrokes available also in the tiny version.

Date and version are updated to match each release, so the user does
not have to wonder whether the man page really describes the binary.

Also remove a bit of superfluous markup.