BIS-753: Changed httpMaxContentLength data store setting to allow upload file in 1MiB chunks, which are base64-encoded.

This reverts commit 2570a103.

BIS-753: Working on the bar with disk space. Planed the indicator on the same line with the navigation bar.

BIS-753: Working on attaching the DSS widget to a concrete collection/object. Fixed the problem with listing files for an entity that has no folder on the FS.

BIS-753: Working on attaching the DSS widget to a concrete collection/object. Fixed the problem with listing files for an entity that has no folder on the FS.