Changed all commands that use long arguments to short arguments in the installation script and Makefile. This improves compatibility, as short arguments are more universally supported.
* Add `-y` and `--yes` command-line arguments to the installation script. Setting this argument sets the `auto_confirm_prompts` variable to `true`. When a confirmation is needed, the variable is checked to determine whether to show a prompt or to auto-confirm.
* Add `print_usage` function to print basic help and usage information. It is shown if an unsupported argument is supplied (including `-h` and --`help`).
This changes adds better upgrade handling. If a previous installation is detected, the user is prompted to upgrade and only the steps necessary to upgrade are performed. This change also simplifies variables for source/target bin and config file.
