Update Archival location

[gspinaci]

The archival location should be handled differently. We should open a new frame on the right with the Archival Unit page (vocabulary)

First, we need to upgrade the form to add new archives (it's a vocabulary). There, when adding a new archival level, we need to get the depth (it will be used later to visualize the right order). Also two other things: the acronym that will be displayed if present, maybe the style in which we should visualize the archival location (e.g., italic and so on).

For this reason, we decided to open a new frame when updating the archival location, like in the following picture

Requirements: https://github.com/villaitatti/archipelago/issues/38

[gspinaci]

See: https://github.com/villaitatti/archipelago/wiki/Showing-archival-location-full-path

[gspinaci]

Add the following feature: https://github.com/villaitatti/archipelago/issues/50