Kill enough K&R cruft to build with clang again.

ksh: Upgrade to C99 <stdbool.h>

This shell already used C99 functions.

Implement (somewhat enhanced) idea stealed from bash:
when completing the filename (either in vi mode with vi-tabcomplete on,
or in emacs mode after double esc), escape any shell special characters
a

Implement (somewhat enhanced) idea stealed from bash:
when completing the filename (either in vi mode with vi-tabcomplete on,
or in emacs mode after double esc), escape any shell special characters
and chars from $IFS with backslash - very handy especially when
dealing with filenames containing spaces

The patch has been sent to maintainer, but I haven't got any reply yet even
after about a month :(

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RCS ID Police

import pdksh 5.2.8