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First try to fix issue #97.

Also removed some non-existent features from the description

A fix to issue #86: Adding gnuft condition as well as removing unit_investLP and unit_investMIP conditions and p_unit(unit, 'unitCount') from q_inertiaMin. Using p_unit(unit, 'unitCount') causes division by zero problems for units with investment variables and without online variables.

Adding gnuft condition to five other equations as well: q_instantaneousShareMax, q_capacityMargin, q_energyShareMax, q_energyShareMin and q_minCons. Using unit aggregation and these equations without the gnuft condition might have caused problems.

Fixing ramp constraints so that they work when integer investment variables are used together with continuous online variables (issue #88).

ran li authored Jul 10, 2019 and ran li committed Jul 10, 2019

Ciara's codes:minCons constraint allows to set the min load for PHS while still allowing foll reserve

Updates related to issue #85: ignoring 'empty' units and changing the condition when to expand effLevelGroupUnit

*effLevelGroup* is now expanded so that subsequent *effLevels* are repeated from the previous *effLevel* if definition is missing. Execution is aborted if *level1* information is missing for any unit.

#82: All hard-coded *elec* grids have been removed and replaced by looping/summing over *gn* instead. This fix should work as long as no *node* belongs to multiple *grids*, which I think is already ill-advised (or even forbidden?).

Reading changes.inc just from the 1e_inputs.gms (it was also in 1e_scenChanges.gms). Updating sceleton.json and removing obsolete reference to includeInputdata_ext.inc.

(cherry picked from commit 45076128)