Refactor code so no copy of settings is kept.
Set the current group correctly (see #10334)
Add doc.
Do no allow to add files to queue when loading data.
Fix import of plate and link to screen (see #10322)

The problem only occurs when a folder is selected and the
folder contains a plate and a non plate file.
Fix loading of data (see #10333)
Do keep reference to current group.
Merge pull request #700 from jburel/import-bugs

Import bugs