Squashed 'cde/programs/dtksh/ksh93/' content from commit 66e1d4464

git-subtree-dir: cde/programs/dtksh/ksh93
git-subtree-split: 66e1d44642

TODO

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+TODO for AT&T ksh93, 93u+m bugfix branch
+
+See the issue tracker:
+https://github.com/ksh93/ksh/issues
+
+______
+Fix regression test failures:
+
+- There are many regression test failures on NetBSD.
+
+______
+Fix build system:
+
+- ksh does not currently build on QNX.
+
+______
+Fix currently known bugs affecting shell scripting. These are identified by
+their modernish IDs. For exact details, see code/comments in:
+https://github.com/modernish/modernish/tree/0.16/lib/modernish/cap/
+
+- BUG_BRACQUOT: shell quoting within bracket patterns has no effect. This
+  bug means the '-' retains it special meaning of 'character range', and an
+  initial ! (and, on some shells, ^) retains the meaning of negation, even
+  in quoted strings within bracket patterns, including quoted variables.
+
+- BUG_CSUBSTDO: If standard output (file descriptor 1) is closed before
+  entering a $(command substitution), and any other file descriptors are
+  redirected within the command substitution, commands such as 'echo' will
+  not work within the command substitution, acting as if standard output is
+  still closed.
+
+- BUG_IFSGLOBS: In glob pattern matching (as in case or parameter
+  substitution with # and %), if IFS starts with ? or * and the "$*"
+  parameter expansion inserts any IFS separator characters, those characters
+  are erroneously interpreted as wildcards when quoted "$*" is used as the
+  glob pattern.