Separate production units from product names

[shawnbot]

Right now the units are included in the product name, so we see stuff like "Oil (bbl)" all over the place. In the new state pages (and in our intermediate database) we should split the units from each product so that we can pull them out into the Jekyll data and display them on different places, e.g. in table headings or in text descriptions. Here are two ways of doing it:

1. Always have a units field alongside production numbers, e.g.

   products:
     'Oil':
       units: 'bbl'
       volume:
         '2003': 240138

   This would mean needing to split those fields up before they're put into the database, but that should be pretty simple.

2. Maintain a separate dictionary for units of each product:

   Oil: 'bbl'
   Coal: 'short tons'

   This has one little problem: some products, such as Geothermal, are actually measured in multiple units, e.g. "Geothermal - Direct Utilization, Millions of BTUs" and "Geothermal - Electrical Generation, Other".

[gemfarmer]

This has one little problem: some products, such as Geothermal, are actually measured in multiple units, e.g. "Geothermal - Direct Utilization, Millions of BTUs" and "Geothermal - Electrical Generation, Other".

@shawnbot for this ^^ reason, I think #1 makes more sense.

[shawnbot]

Okay, I'm looking into this now.

[shawnbot]

This is essentially done in #1395, and the remaining details can be discussed in #1396. Closing!