Use NCO to automatically exclude 3D variables

[forsyth2]

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Issue description

See #697 (comment). This should allow us to skip the vars_exclude parameter. Note this requires using the latest NCO.

[czender]

Note that as currently implemented, this functionality works when the user does not provide and extraction list for what we call global timeseries. In that case ncclimo creates its own extraction list of all the single-level, 2D spatial timeseries variables. If a user explicitly specifies a multi-level field (e.g., like U in EAM or H2OSOI in ELM) then ncclimo will fail. If there is interest, I can make ncclimo ignore bad user choices (i.e., multi-level fields), though that can be a slippery slope. Feedback welcome.