Create a family abundance matrix

[cjgrady]

This matrix should be an aggregate of PAM data. The rows should still represent sites but the columns should represent the number of species present for a family at those sites (sum of PAM columns).

• [x] Create a mapping of species / genus to family
• [x] Create a matrix for family abundances
• [x] Create a mapping for family to matrix column
• [x] Populate the family abundance matrix