keep all metadata in transformed raw

[dominikwelke]

closes #122

[vferat]

Hello @dominikwelke

Thanks for the contribution.
Keeping the metadata from the raw file is indeed a good idea.
There are a few points that should be checked, however, such as the projectors and the high-pass/low-pass filters, which could lead to errors in the subsequent analysis stages.
I’ll have a quick look to see which ones are critical before merging.

[dominikwelke]

yes, projectors could be something to check out first.
filters, i dont think so.. if you take the Raw shell from just before submitting the data to transform_epochs nothing changes anymore, right?

also its not generally stored anywhere what has been done to the data before.
that being said, it might be nice to add a log entry to Inst.info["proc_history"]