mksh R52

R52 is a strongly recommended bugfix release:

• Move moving external link from mksh(1) to the #ksh channel homepage linked therein
• Make setenv “set -u”-safe and fix when invoked with no args
• Make “typeset -f” output reentrant if name is a reserved word
• Zero-pad seconds in “time” output to align columns
• Check signals and errorlevels from OS to be within bounds
• Quote and document ‘;’ as PATH separator in some places
• Simplify code to call afree() even if arg is NULL
• Fix tree-printing and reentrancy of multiple here documents
• Work around LP#1030581 by permitting exactly one space after
• Code quality work, cleanups
• New code for here documents/strings with several bugfixes
• Stop using issetugid(2) for ±p checks, wrong tool for the job
• Reintroduce some -o posix changes lost in 2005, plus fixes
• Make “source” into a built-in command
• Drop “stop” alias, lksh(1) functionality to auto-unalias
• Fix \u0000 ignored in $'…' and print
• Improve portability of Build.sh
• Improve portability of testsuite
• Fix tilde expansion for some substitutions
• Improve reparsing of ((…) |…) as ( (…) |…)
• Fix test(1) not returning evaluation errors
• Fix ${*:+x} constructs (carstenh)
• Make (( … )) into a compound command (ormaaj)
• Repair a few parameter substitution expansion mistakes