Correct set alignment

[trevorb1]

In this PR I add functionality to define option data over any set. for example, to apply an emission limit and a capacity constraint to the same scenario data, you can define data like so:

PARAMETER,REGION,TECHNOLOGY,EMISSION,OPTION,YEAR,VALUE
TotalAnnualMaxCapacityInvestment,UTOPIA,IMPHCO1,,0,1990,999999999
TotalAnnualMaxCapacityInvestment,UTOPIA,IMPHCO1,,0,1991,999999999
TotalAnnualMaxCapacityInvestment,UTOPIA,IMPHCO1,,0,1992,999999999
...
AnnualEmissionLimit,UTOPIA,,NOX,0,,-50 
AnnualEmissionLimit,UTOPIA,,NOX,1,,-10000

While this bypasses the error described in issue #85, I am a little confused on how logic of handling data that is not defined over all sets (ie. AnnualEmissionLimit does not have an associated year in the provided example in the issue ticket). @HauHe was this just a mistake? Im not sure where to look to see if AnnualEmissionLimit is being applied correctly. I would suggest explicitly defining the year.

[HauHe]

Thanks a lot @trevorb1!
I will have a look at it tomorrow.
If I remember correctly I had left the year here on purpose, but I'm not 100% sure anymore what behaviour I expected when applying the data. Has been some time since I wrote the code. I'll let you know