Better setup.py with installation of scripts

[antpiron]

Dear SUPPA2 dev.,

In this small patch:

• I added a setup.py based on the one used for pip which was missing in the repository;
• The scripts are also installed (more than just the library);
• The script files are now prefixed with suppa2_ in order to not pollute the namespace as they are installed;
• I moved the sub-commands in the library in the suppa directory;
• I updated the README.md accordingly;
• I made some cleanup of the line terminator which were a mix of dos/unix with dos2unix command.

After an install using

python3 setup.py install

suppa2.py is callable without the full path and the scripts with suppa2_NAMEOFTHESCRIPT.

Best regards,
Anthony.

[abearab]

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