ESS-DIVE V2

In pre-release while data package is under review on ESS-DIVE

This release is associated with V2 of https://doi.org/10.15485/1960313.

Changes:

• scripts for soil and sediment visual metrics, soil cations, and soil extractable iron
  soil_cec.R
  soil_iron.R
  soilsediment_visual_metrics.R
• edits to sample catalog and l2 scripts
  sample_catalog_matrix.R
  l0_to_l2.R

Submission to Nature Scientific Data

This release includes all code to reproduce version 1 of our ESS-DIVE data package (https://data.ess-dive.lbl.gov/view/doi:10.15485/1960313), which is also detailed in the Nature Scientific Data Descriptor submission.