Filtering OSeMOSYS UseByTechnology results

[AgnesBelt]

When filtering results by fuel from UseByTechnology.csv, some of the values returned are not correct.

UseByTechnology.csv provides results in the following format:

Region	Timeslice	Technology	Fuel	Year	Value
Globe	ID	ALUPLANT	C1_S_ELC	2010	0.9782
Globe	ID	ALUPLANT	C1_S_ELC	2011	0.9822
Globe	ID	ALUPLANT	C1_S_ELC	2012	1.0104
Globe	IN	ALUPLANT	C1_S_ELC	2010	0.9782
Globe	IN	ALUPLANT	C1_S_ELC	2011	0.9822
Globe	IP	ALUPLANT	C1_S_ELC	2010	0.9782
Globe	IP	ALUPLANT	C1_S_ELC	2011	0.9822

It seems there is an issue with summing the values for technology/fuel combination across different timeslices.
Per each year, the script should filter the technology(ALUPLANT)/fuel(C1_S_ELC) combination and sum all values across different timeslices. If more technologies are aggregated and filtered based on the same fuels, the sum of all technologies(e.g. ALUPLANT,CEMPLANT,STEPLANT)/fuel(C1_S_ELC) combinations across timeslices should be returned.

Taking as example the filtering of secondary electricity (fuel = C1_S_ELC) used by Industries (technologies = ALUPLANT, CEMPLANT, FERTPLANT, PAPPLANT, PETAPLANT, PETBPLANT, STEPLANT) in GLUCOSE, the following results as indicated under FinalEnergy|Industry|Electricity in here should be obtained.