Make it possible to open several files at once

[ghost]

I would like to ^O, select several files, using alt for adding/removing a file to/from the selection, and shift for adding/removing a range to/from the selection, which would then be opened in one tab per file.

[dacap]

I thought that there were an issue related to this (as this feature was requested before), but I didn't find it. I would like this for v1.2.