Parsing extra matpower data fields

[Sofia-Taylor]

Matpower files can store extra data sections and columns that are not in the standard caseformat (e.g., to indicate bus names, generator types, branch lengths, etc.). However, the Egret matpower parser skips these extra data fields (with a warning). Adding the extra data fields to the Egret dictionary would be a useful feature for easily translating between matpower files and Egret dictionaries.

Attaching a simple example for case14.m.
parse_matpower_data.zip