v1.0.0

• Breaking Change: rename model Region to Zone for clarity. Prior case files without modification can run into error.
• Fix bugs in RTED.dc2ac
• Minor refacotr OptzBase.get_idx to reduce duplication
• Rename module OptBase to OptzBase for clarity
• Update benchamrk figure in README
• Set ANDES requirement to v1.9.3
• Deprecate method get_idx and suggest using get_all_idxes instead
• Remove module benchmarks.py and its tests for simplicity