Added saber_compare.py, saber_download.py, thermo_compare.py, and tim…

[DanBrandt]

…efile_compare.py; these files download SABER data, interpolate GITM results to the SABER locations, compare GITM outputs to GOCE along the orbit trajectory, and compare up to 3 timefiles made by thermo_goce.py against each other.

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[aaronjridley]

These files are useful. We will eventually move these types of comparison tools to pyitm, so that we can use them with multiple models. But for now, this is a fine place for them.