Log Message:

update to version 0.6.0

    Major changes:

    - Symbols "'`*\?&|; etc. are correctly escaped before eval'ed.
      As a result all these symbols are allowed in commands.
      For example,

        # the following command outputs ''??????{}!&| --- ??????{}!&|'''
        runpipe_base \
           awk 'BEGIN {print "+*<>(){}!&|"; exit 41}'  '|' \
           sed 's,[+*<>()],?,g' '|' \
           awk '{print $0 " --- " $0; exit 43}' '|' \
           awk "{print \"''\" \$0 \"'''\"; exit 44}"
        echo "$pipestatus_all" # '41 0 43 44'
        echo "$pipestatus_1"   # '41'
        echo "$pipestatus_2"   # '0'
        echo "$pipestatus_3"   # '43'
        echo "$pipestatus_4"   # '44'
        echo "$pipesize"       # '4'

      Regresion test for this case.

    - Support for shitty Solaris /bin/sh
       $(()) is replaced with expr(1),
       $() -- with ``,
       for i -- with for i in "$@"

    - Makefile: new target "test_all" for testing all available shells