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Add the -h|--help option.
Fix a mistake with setting up the HEREDOC.
Add an error message on stderr when the wrong number of arguments are detected, rather than just printing the help text. Print the help text when the wrong number of arguments are detected, rather than calling a non-existent function. Fix the help text to properly note grouped required options vs optional, and when optional arguments require prior optional arguments.
/closes #21 #22 #23