Header in outFileNameMatrix TSV file has extra fields

[marcoct]

The names of the regions are the first column names in the header.

The issue seems to be because of a missing info = [] above this line:

https://github.com/deeptools/deepTools/blob/ac42d29c298c026aa0c53c9db2553087ebc86b97/deeptools/heatmapper.py#L981

This bug causes, when reading the data into pandas, the entire data frame to be shifted, with a number of NaN columns at the end that is equal to the number of regions.