Added better support for EELS data

See merge request !416

Fix issue #631

See merge request !417

V1.0.0 issue577

See merge request !415

Some fixes in gui part regarding DataTable

See merge request !413

next_page_after_value should not be in the response when the search reaches end of data

It should not return next_page_after_value when it reaches end of data

It should affect everywhere that uses this basic search module

renaming "name" to "upload_name"

See merge request !411

Refactoring metadata: using a consistent flat structure in MongoDB

See merge request !409

Removing OasisMetadata and related old oasis metadata import mechanism, plus improved tests of new oasis export