Small improvements to command line arguments

[miloknowles]

I was originally debugging the --small option for the data pipeline, which crashes at the EIA-930 cleaning step. During that process, I made a couple improvements to how command line arguments are handled in data_pipeline.py:

• Boolean flags like --small, --flat, and --skip_outputs don't need a value after them any more. If you omit these arguments, the default is used. If you include --small, that value will be true. This is to be more consistent with other command line interfaces.
• I added a step to print out the command line arguments that are being used, so that they're clearly shown to the user and captured in the logs.

EDIT: Added one more change to this PR:

• If the logger is outputting to a file, makes sure that the directory for that file exists (otherwise an error will be thrown)

[miloknowles]

FWIW, the --small option only works right now if you also do --flat so that EIA-930 cleaning is skipped.

[grgmiller]

Thanks, Milo. I'll take a look. I think that maybe we may get rid of the -small argument altogether as part of our upcoming infrastructure improvements, so not sure if it is worth our time to update it further.

[miloknowles]

Thanks, Milo. I'll take a look. I think that maybe we may get rid of the -small argument altogether as part of our upcoming infrastructure improvements, so not sure if it is worth our time to update it further.

I think having a --small option is still useful for testing and debugging. Currently, I'm using it as a faster way to test out a CI/CD pipeline for OGE.