Avoid TypeErrors on FolderPicker select mutation

Closes #304

See merge request !626

Explicit error for null parents in ElementNeighbors

Closes #301

See merge request !623

Cross-module store testing support

Closes #305

See merge request !625

Fix Lodash vulnerability

Closes #284

See merge request !622

Fix missing results from deduplicated calls to ListElementChildren

Closes #300

See merge request !621

Remove DataImport payload usage

See merge request !618

Remove folder picker search leftovers

Closes #296

See merge request !617

Actually save the classification when creating a new sub element.

Closes #291

See merge request !616

Send both folder_type and folder_id for IIIF imports

See merge request !615

Fix workflows on a selection

Closes #290

See merge request !614

Specify Elements mode when calling CorpusWorkflow endpoint

Closes backend#314

See merge request !606

Folder picker modal for file imports

Closes #244

See merge request !613

Prevent submitting parent forms when closing a modal

See merge request !612

A weird issue noticed while working on #244:
clicking the OK button inside of a Modal causes the modal to close,
but also triggers `submit` events on all parent <form> elements.

Store dataimport from files

See merge request !611

Set the source of created transcriptions to manual

Closes #283

See merge request !610

Avoid stale read when creating a workflow from a corpus selection.

Closes #266

See merge request !607

Fix a filtering condition for elements of a tree children

Closes #281

See merge request !608