Deprecate _modify_eval_columns_to_ensure_version_compatibilty in RSMCompare

[aloukina]

The Comparer class in comparer.py currently contains a class _modify_eval_columns_to_ensure_version_compatibilty to allow running RSMCompare on outputs from RSMTool < 7.0. I think it's time to deprecate this.

[Frost45]

It seems that in later versions of RSMTool, we want to remove support for SMD, in subgroup calculations, and only support DSM. However, SMD is used for all lists of column names (both raw and scaled). See lines 29 and 36 for example, and is only changed to DSM inside _modify_eval_columns_to_ensure_version_compatibilty(), a function we want to deprecate.

Essentially, this issue is larger than initially assumed. Will be dealt with in a later release.

[Frost45]

Also, no warnings are filtered in _modify_eval_columns_to_ensure_version_compatibilty, but filter_warnings is passed as an argument to the function.