Shift to US$2017 for currency units

[fbenke-pik]

• default unit assumption for Dollar Units, unless specified explicitly: for US$, we assume US$MER, not Int$PPP

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (72857cb) to head (92ee3ff).
Report is 54 commits behind head on master.

Files	Patch %	Lines
R/calcMAgPIEReport.R	0.00%	14 Missing ⚠️
R/calcConstructionWoodDemand.R	0.00%	6 Missing ⚠️
R/convertImageMacc.R	0.00%	5 Missing ⚠️
R/convertGTAPv8v9.R	0.00%	3 Missing ⚠️
R/calcMACCsCH4.R	0.00%	1 Missing ⚠️
R/calcMACCsN2O.R	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #117      +/-   ##
=========================================
- Coverage    0.11%   0.00%   -0.11%     
=========================================
  Files         312     239      -73     
  Lines       17261   12971    -4290     
=========================================
- Hits           20       1      -19     
+ Misses      17241   12970    -4271     

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