vers. 0.6.6

This patch addresses media storage and data integrity. Various scientifiy properties were corrected, the unit system improved.

What's Changed

• Implemented blobs (#15) as raw data storage
• Reworked database stats and meta data
• Fixed physical quantities / units
• Centralized attribution data (for blobs and media)
• Added context field to Value types
• Enrich value types with a physical quantity unit field only when applicable
• Fixed properties within multiple collections

Full Changelog: v0.6.5...v0.6.6