Link two items as a version

[kosarko]

Since v7, versions are no longer maintained just by replaces/replaced by metadata; there are version/versionhistory tables

We need some mechanism (curation task, process) that, when given two items, will link them as versions.

Our submission-forms enable filling dc.relation.replaces - but this is not connected to version creation in any way. I don't think we want get rid of this...

11234/1-5537 & 11234/1-6033 should be connected. Are there others? How do we find out?

[kuchtiak-ufal]

Pull request: #1304

[kuchtiak-ufal]

Implemented.

New item-version-linker task (process) implemented, for admin user only.

Usage

usage: item-version-linker
 -h,--help             help
 -l,--link             link item with the previous item
 -u,--unlink           unlink item from the previous item in version history.
 -p,--previous <arg>   item handle, or UUID, of the previous (left) item that is intended to be linked with the (right) item (only required for link option)
 -i,--item <arg>       item handle, or UUID, of the (right) item that is intended to be linked/unlinked with/from the previous item (required for both link and unlink options)