* #308 (2): resolve re-render issue

* #308: second iteration
* resolve UI left/right placement

Also, implemented list selection on the Corpus/New screen.

* #324

* #314: Folder View: Split Horizontal / Vertical for folder or code views
* Sidebar UI/UX enhancement
* SASS members addition for left/right handling
* link handling hook interface

This was used only for testing frontend errors, commited by accident.

This way we can have a handle of the errors in the high-level
components. Before they were implicitly discarded.

* Issue #315