perltidy Files

This release fixes a few minor issues.

## 2019 09 15

    - fixed issue RT#130344: false warning "operator in print statement" 
      for "use lib". 

    - fixed issue RT#130304: standard error output should include filename.
      When perltidy error messages are directed to the standard error output 
      with -se or --standard-error-output, the message lines now have a prefix 
      'filename:' for clarification in case multiple files 
      are processed, where 'filename' is the name of the input file.  If 
      input is from the standard input the displayed filename is '<stdin>', 
      and if it is from a data structure then displayed filename 
      is '<source_stream>'.

    - implement issue RT#130425: check mode.  A new flag '--assert-tidy'
      will cause an error message if the output script is not identical to
      the input script. For completeness, the opposite flag '--assert-untidy'
      has also been added.  The next item, RT#130297, insures that the script
      will exit with a non-zero exit flag if the assertion fails.

    - fixed issue RT#130297; the perltidy script now exits with a nonzero exit 
      status if it wrote to the standard error output. Prevously only fatal
      run errors produced a non-zero exit flag. Now, even non-fatal messages
      requested with the -w flag will cause a non-zero exit flag.  The exit
      flag now has these values:

         0 = no errors
         1 = perltidy could not run to completion due to errors
         2 = perltidy ran to completion with error messages

    - added warning message for RT#130008, which warns of conflicting input
      parameters -iob and -bom or -boc.

    - fixed RT#129850; concerning a space between a closing block brace and
      opening bracket or brace, as occurs before the '[' in this line:

       my @addunix = map { File::Spec::Unix->catfile( @ROOT, @$_ ) } ['b'];

      Formerly, any space was removed. Now it is optional, and the output will
      follow the input.

    - fixed issue git#13, needless trailing whitespace in error message

    - fixed issue git#9: if the -ce (--cuddled-else) flag is used,
      do not try to form new one line blocks for a block type 
      specified with -cbl, particularly map, sort, grep

    - iteration speedup for unchanged code.  Previously, when iterations were
      requested, at least two formatting passes were made. Now just a single pass
      is made if the formatted code is identical to the input code.

    - some improved vertical alignments