Add graphs of industrial energy-related emissions by industry and by gas

[jrissman]

The web interface currently has four industrial GHG emissions graphs:

• Total, by industry
• Total, by gas
• Process emissions, by industry
• Process emissions, by gas

It would be useful to have two more:

• Energy-related (non-process) emissions, by industry
• Energy-related (non-process) emissions, by gas

[jrissman]

Completed in d5bcd5d. Will be included in 2.1.1 release.