maruo

Add option to display t-statistics instead of standard errors below coefficients

1

Compared to the open #78 pull request, this one takes the t statistics from the statsmodels models directly. Also, the tstats are displayed below the coefficients with e.g. "t=1.9645" instead...

As for text in the features and notes, if custom column names are provided, the special characters in there are escaped as well.