Opf

- Add 2 cases from the Synthetic Australian system project
- Add 5 cases from the EPIGRIDS project
- Revised API cases to have more realistic reactive power dispatch, see PowerModelsAnnex v0.9
- Updated baseline results and case generation to PowerModels v0.19

- Add 60 bus Nordic system and 8387 bus pegase system

- Add 18 cases from ARPA-e's Grid Optimization Competition, Challenge 1 Final Event
- Update some case names from `_tamu` to `_activ` (26)
- Updated baseline results and case generation to PowerModels v0.17
- Removed `pglib_opf_case30_fsr.m` due to marginal benchmarking value
- Removed 500, 2000 and 10000 bus `activ` cases in favor of similar grid optimization competition cases
- Removed 2316 bus `SDET` case in favor of similar grid optimization competition cases

- Minor fixes to generator bounds, 22, 29

- Fixed generator voltage setpoints, 5
- Made thermal limits monotonic, 15
- Updated Polish network source files to MATPOWER v7.0, 17
- Simplified generator data, 18
- Made minor corrections to the fuel cost model
- Updated baseline results and case generation to PowerModels v0.9

- Add TAMU cases, 7
- Add SDET cases, 11
- Add GOC cases