Log Message:

version -> 0.5.0

  Major changes

    - 'check_status_re' and therefore 'runpipe_re' use 'grep -E'
      instead of 'grep' in order to simplify regexp that
      contains >=2 digit exit statuses.

      NOTE: Formally speaking this breaks backward compatibility.

    - If PIPESTATUS_VERBOSE variable is set to non-empty string, then
      check_status0 and check_status_re functions print an error
      message to stderr.