Batch management of mappings

[nichtich]

This issue subsumes multiple related feature request to allow management of multiple mappings without having to load each individual mapping into mapping editor. Some uses cases:

• Create multiple mappings that only differ in source concept, e.g. several concepts in source vocabulary map to the same target concept with the same mapping type and same concordance (Idea: Batch creation of mappings #699)
• Open a CSV file of mappings and check which of its mappings to save (Facilitate mapping with OpenRefine #606)
• Review a list of mappings or mappings suggestions and save or skip mappings with one-click

The common pattern includes a list of mappings, each with status (saved/not saved) and at least the following actions:

• create a new list of mappings (from search result or from CSV)
• add a mapping to the list
• remove a mapping from the list
• flush list (remove all mappings)
• change type of all mappings
• change target concept of all mappings
• save all mappings
• save individual mapping

The editable list of mappings could be saved in the browser like favorite concepts or it could be non-persistent.