Scenes features, subprocess-safety, more parameters accepted, fixes & deprecations

Added

• Scene.download, SceneCollection.download, and SceneCollection.download_mosaic methods
• Colormaps supported in descarteslabs.scenes.display
• Task namespaces are automatically created with the first task group

Changed

• Clients can safely be used in subprocesses without causing obscure SSL errors
• descarteslabs.scenes.search will take a Python datetime object in addition to a string
• Scenes will now allow Features and FeatureCollections in addition to GeoJSON geometry types
• Fixed Scenes issue preventing access to products with multi-byte data but single-byte alpha bands
• Scenes now exposes more parameters from raster and metadata

Deprecations

• Removed extra keyword arguments from places client
• Added deprecation warnings for parameters that have been renamed in the Metadata client