Added short options to --files and --number-files, to type faster and working better.
Defines -F for --files and -N for --number-files.
Added diffview/ wuth shell scripts that already use previous commit and are tools help users to read patches, I use it on work .
Have a README.txt file with a brief explanation of what we can do with the scripts .
Implements inverted ranges, if range begins with "i" show the oposite result of the result of the
select range . Applied on --files, --lines and --hunks.