- Avoid duplicate error messages when invalid options are used with the
  cd, pwd, fc, and export builtins.
- Handle window size changes when line editing is enabled.
- Don't access memory after it is free()'d, fixing strange job control
  problems when the J (junk) malloc() option was enabled.
- Read libedit options from ~/.editrc if present.
- Change the `command' builtin to be what POSIX.2 requires, create a
  `builtin' command to execute builtin commands.
- Add a `bind' builtin command to modify key bindings.
- Store process ID's in pid_t's instead of short's.
- Removed unused #ifdef'd code.
- -P (-o physical) option to make -P the default for the cd and pwd builtins

libedit history interface is still used. This gives the following
new features/bug fixes:
 - Quote output of alias, export, readonly builtins
 - -L (logical) and -P (physical) options added to cd and pwd, logical
   behaviour made default.
 - -C (noclobber) option and >>| redirection is implemented
 - hash builtin only shows normal commands, no functions or builtins
 - -u (nounset) option is implemented
 - fc builtin's -e option works correctly again
 - No longer assumes there is a tty on fd 2 (PR 36671)
 - fg/bg command show more info about job being manipulated
 - -l and -s options added to jobs builtin, output closer to POSIX spec.
 - %+ (current job) %- (previous job) and %? (substring) job ID's implemented
 - >&- (and similar) redirection operators close descriptors correctly
 - set +o output corrected
 - Style: __FBSDID, __P removal, ANSI-style function declarations

PR:		36141
Approved by:	cracauer

- stack fixes (from tegge)
- backout of parts of my 8-bit fixes
- type for absolute paths

  PATH=... command

Noted by and fix works for Marcel Moolenaar <marcel@scc.nl>

Obtained from: NetBSD