Transfer LCAO wfc to pw basis

[hongriTianqi]

[hongriTianqi]

This topic is mentioned by @mohanchen.

[Fadelis98]

The inverse transform that transforms pw wfc to lcao basis would be very useful as well, but it now suffers for low accuracy, did you plan to implement it? I investigated this topic before, and I would recommand this paper: https://pubs.aip.org/aip/jcp/article/143/10/104109/898790/A-projection-free-method-for-representing-plane

[hongriTianqi]

@mohanchen Do you have comments on this issue? thanks.

[mohanchen]

I will think about it