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)

Fixing a bug in ramp tier limits: For units with shutdown trajectories, the ramp tier limit was twofold at the interval when the shutdown begins.

Resolved conflicts in inc/2d_constraints.gms (e.g. start-up and shutdown variables).

Adding an example of a post-processing file: 4d_postProcess_invest2schedule_temp.gms. The contents of the file can be copied to a 4d_postProcess.gms file and saved in the input folder so that it is read by Backbone. The contents of the file is meant for saving the invest model results in a format that can be directly used by the schedule model. The results transfer works when running Backbone using Titan and when the schedule setup is a child of the invest setup in the Titan setup tree. The invest model writes and outputs a changes.inc file which is then read by the schedule model.

# Conflicts:
#	inc/3c_inputsLoop.gms