Restructure tech naming in config.yaml

[trevorb1]

In pr #96 we clarified what are fuels and what are techs in the config.yaml file (yay!). This highlighted a bigger problem that we are repeating fuel definitions in the configuration file, which is making tracking the flow of data hard.

Canada-U.S.-ElecTrade/scripts/config.yaml

Lines 31 to 75 in a2d6e4f

	techs_master:
	- 'BIO' # Biomass
	- 'CCG' # Gas Combined Cycle
	- 'CTG' # Gas Combustion Turbine
	- 'COA' # Coal
	- 'COC' # Coal CCS
	- 'HYD' # Hydro
	- 'SPV' # Solar
	- 'URN' # Nuclear
	- 'WND' # Wind
	#'P2G' # Power to Gas
	#'FCL' # Fuel Cell
	# list of renewable fuels
	rnw_fuels:
	- 'HYD' # Hydro
	- 'SPV' # Solar
	- 'WND' # Wind
	- 'BIO' # Biomass
	# list of mining fuels
	mine_fuels:
	- 'COA' # Coal
	- 'GAS' # Gas
	- 'URN' # Nuclear
	# list of variable techs
	variable_techs:
	- 'SPV'
	- 'WND'
	# list of storage technologies (In the future may have 'TNK' # Tank)
	sto_techs: []
	# mapping of technologies to fuels
	tech_to_fuel:
	'BIO': 'BIO'
	'CCG': 'GAS'
	'CTG': 'GAS'
	'COA': 'COA'
	'COC': 'COA'
	'HYD': 'HYD'
	'SPV': 'SPV'
	'URN': 'URN'
	'WND': 'WND'

Im wondering if its better to remove the mine_fuels and rnw_fuels and instead specify what technologies are renewable and consumable fuels (ie. require MIN) techs. Then we can just search through the tech_to_fuel dictionary to get the fuels?

So the master_techs dictionary would instead look something like...

PWR: 
    MIN: 
       - 'URN' # Nuclear 
       - 'CCG' # Gas Combined Cycle  
       - 'CTG' # Gas Combustion Turbine 
       - 'COA' # Coal 
       - 'COC' # Coal CCS 
    RNW: 
       - 'HYD' # Hydro  
       - 'SPV' # Solar 
       - 'WND' # Wind
       - 'BIO' # Biomass 

This may also simplify the the techDataFrame( ... ) function as well (so we arnt mixing techs and fuels quite as much)