msgc.1: fix typos

Remove the advertising clause with the explicit ok from Perry E. Metzger.

Use mdoc macros only.

Add msg_printf(fmt, ...), a function to display raw messages without
going through the message catalog.

MENU_name -> MSG_name

Simplify markup.

Fix preamble to match order set out by mdoc(7). Discussed with wiz.

Bump date for previous.

Add a msg_row() function that returns the current screen row.
Allows sysinst to place menus below any header text.
Remove msg_*.1 man pages for all the functions (they are in the wrong place
are a fa

Add a msg_row() function that returns the current screen row.
Allows sysinst to place menus below any header text.
Remove msg_*.1 man pages for all the functions (they are in the wrong place
are a fair waste of directory space).

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Add msg_prompt_win() that will prompt in the specified window (instead of
the default one), and with a box around the window if >= 3 lines.
Stop the char delete from killingthe RHS of any box.
Make m

Add msg_prompt_win() that will prompt in the specified window (instead of
the default one), and with a box around the window if >= 3 lines.
Stop the char delete from killingthe RHS of any box.
Make msg_string a noop for invalid strings (might be quoted text).

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Begin new sentences on new lines. Minor mdoc improvements.

Use standard headers.

Whitespace cleanup.

Fix typos and wording.

Document paragraph-filling behavior of msg_display{,_add}(), and
document function of msg_table_add(). What a whacko api.

Add msg_*() functions to NAME (they are already in SYNOPSIS), and
add MLINKS for them. Perhaps later on they should be broken out into
a section other than 1? At least now they are findable via "man

Add msg_*() functions to NAME (they are already in SYNOPSIS), and
add MLINKS for them. Perhaps later on they should be broken out into
a section other than 1? At least now they are findable via "man -k" etc.

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Add FILES and EVIRONMENT sections detailing what files these programs use,
where they live, and how to modify that behavior.

nuke msg_printf() and msg_printf_add().

const-ify strings as appropriate, and convert message 'numbers' from
ints to 'msg's. 'msg' is currently typedef'd as 'const char *', but it'll
become more complex eventually.

privatize msg_beep

nuke msg_{,no}echo, add msg_prompt_noecho

nuke msg_prompt_str, msg_prompt_addstr, and msg_table (unused), and make
msg_vprintf private.

provide APIs (currently mostly undocumented) to print pre-formatted
(table) text.

It was a bad idea to call a function 'beep'.
Rename it to msg_beep to avoid conflicts with the new curses.h.

More and more .Os cleanups. .Os is defined in the tmac.doc-common file,
so we shouldn't override it with versions in the manpages. Many more to
come.