Delete obsolete /* ARGSUSED */ lint comments.

ok miod@ millert@

Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly so

Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly sorted.
Moves the remainder of sysdef.h to other files (mostly def.h) and deletes
sysdef.h now that it's no longer contains anything.
Tweak a comment that references sysdef.h so that it no longer does that.
ok florian@

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* move sys/queue.h inclusion to sysdef.h (it's system specific)
* add <signal.h> to sysdef.h (needed for sig_atomic_t on linux, and
we get it by accident on OpenBSD)
* remove <signal.h> from tty.c/sp

* move sys/queue.h inclusion to sysdef.h (it's system specific)
* add <signal.h> to sysdef.h (needed for sig_atomic_t on linux, and
we get it by accident on OpenBSD)
* remove <signal.h> from tty.c/spawn.c (not needed now that it's in sysdef.h)
ok beck

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Add explicit public domain notices to all public domain files.
ok millert@, deraadt@

This is a no binary change which does:

- spelling, punctuation fixes
- variable declaration lineup
- use parentheses for return and sizeof
- K&R function declarations -> ANSI
- other minor code beau

This is a no binary change which does:

- spelling, punctuation fixes
- variable declaration lineup
- use parentheses for return and sizeof
- K&R function declarations -> ANSI
- other minor code beautification

ok henning@

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Finish KNF of prototypes. That should be all of them.
OK vincent@

spaces

$OpenBSD$

More -Wall anmd KNF, from op2@tomahawk.SQUiSH.org

The start of KNF + -Wall. The code has been run through indent but
needs hand fixup. I stopped at keymap.c...

Reverse rutgers change (attachtoparent vs. spawncli)

New ttreinit function that enters application mode, enables the keypad
and resets the tty size.

New spawn module that calls tttidy() to exit app

Reverse rutgers change (attachtoparent vs. spawncli)

New ttreinit function that enters application mode, enables the keypad
and resets the tty size.

New spawn module that calls tttidy() to exit application mode (and cleanup)
then calls ttreinit() after resume to get back into application mode. Assumes
we have job control. This takes advantage of the xterm 'alternate screen'.

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further pruning

initial import of mg2a