calc_quality_summary : dict keys needs to follow snakecase and some renaming

[naik-aakash]

Currently not all keys do not have snake_case convention: got over looked in paper

As lot of things are changed compared to our publication, maybe better to fix them now itself.

Also for example some keys like : charges and bandoverlaps could be renamed to be bit more descriptive as our larger schema already same keys with different data in it on top level

What do you think @JaGeo ?

[JaGeo]

Yeah. Just fix it. We will add additional documentation for it here