Add minimal security.

Upload 1Mb of data.

Add dependencies.

Every validated Data Set (and repsective Data Stream placeholders) once validated become accessible to anonymous user. This implements default data lake policy: all can download data sets but only authenticated can upload

Since 94a179a607d96b5732177fb9e61839577e567cd2 this editor no longer exists, thus replace accordingly.

/reviewed-on !35