Move argument parsing inside if __name__ == '__main__'

[oleddy]

I noticed that in main.py, argument parsing is done outside of the if __name__ == '__main__' statement. This means that if you try to import main as a module or import the run() function from another script (e.g., from deeprtalign.main import run), argparse will throw an error because it is looking for command line arguments. This makes it difficult to, for example, package a script as an executable, because in that context running deeprtalign from the command line (via os.system() for example) rather than importing it as a module causes other issues.

Would it be possible to move all the argument parsing code inside the if __name__ == '__main__' and update the version available for install via pip please? I'm happy to make a fork and submit a pull request if that's easier.

Thanks for building this great tool and making it open source! I really appreciate it.