Norman Tran

Modified _parse_gdx_results in GAMS.py to replace _parse_special_value

6

## Fixes #3624 ## Summary/Motivation: When parsing the results of a model after it has been solved, the level and dual value are obtained through a series of `if` statements...

Updating the Import Statement to Use GAMS new API

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## Summary Updating the `attempt_import` statement in `pyomo\solvers\plugins\solvers\GAMS.py` from `gdxcc` to `gams.core.gdx` to use GAMS new API. ### Rationale The `attempt_import` statement returns `gdxcc_available` as a boolean value that parses...

New GAMS solver interface, writer, and solution loader.

5

## Fixes NA ## Summary/Motivation: This PR introduced a new GAMS solver interface that uses the `LinearRepnVisitor` to enable coefficient gathering when writing out the scalar GAMS model in `gms`...