COMTRADE Import
I am curious if there would be any interest in having COMTRADE import functionality in core pandas. This is a file format used to record electrical transient measurements in a power system. It is defined by [IEEE C37.111](https://en.wikipedia.org/wiki/Comtrade). I have an implementation that reads the files and creates a pandas dataframe. I would be willing to devote some time to creating a read_comtrade() method in pandas if there is interest. Otherwise, I will just create a third-party library.
