Smarter recovery in GUI - do not recover again if only epoch rejections changed

[mmagnuski]

General goals

1. Redesign the way recovered EEG is held in winreject
2. Redesign the checks performed to see if we need to recover again (separate function!)

Discussion

So far the ICAw version that is being recovered was placed in EEG.etc.recov and this was later used to see if it is still relevant.

Consider

❓ the EEG kept in memory could be more raw than what is displayed. Even if bad channels are defined interpolation can be done on the fly. The same with epoch rejection ( all or at least 'post' epochs are held in memory and are ony selected according to rejections when needed)