Don't eat 0 width characters, print them.

remove stray brace

PR/54399: Sören Tempel: Uninitialized memory access in libedit history.
Initialize the buffer using calloc. While here change all malloc(a * sizeof(b))
to calloc(a, sizeof(b)). XXX: should fix reallo

PR/54399: Sören Tempel: Uninitialized memory access in libedit history.
Initialize the buffer using calloc. While here change all malloc(a * sizeof(b))
to calloc(a, sizeof(b)). XXX: should fix realloc similarly.

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Allow wide characters (properly encoded as byte strings according to LC_CTYPE)
to be (perhaps part of) the "invisible" characters in a prompt, or the
required prompt character which follows the liter

Allow wide characters (properly encoded as byte strings according to LC_CTYPE)
to be (perhaps part of) the "invisible" characters in a prompt, or the
required prompt character which follows the literal sequence (this character
must be one with a printing column width >= 1). The literal indicator
character (which is just a marker, and not printed anywhere) (the PSlit
parameter in sh(1)) can also be a wide char (passed to libedit as a wchar_t,
encoded as that by sh(1) or other applications that support this.)

Note: this has currently only been tested with everything ascii (C locale).

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Fix an obvious, but almost invisible typo (avoid some core dumps).

add literal escape sequence support, patterned after the tcsh ones.