Preferred Country or Location for REST or other calls

[mubaldino]

Type of Feature:

• Collaboration or partnership
• Improvement or clarification
• New Processing

Description of Feature
for geotagging allow API calls to take in a list of preferred countries or locations (geohashes for now) that help scope what the caller thinks are the most relevant results.

[mubaldino]

partially implemented. preferred_countries feature in XlayerClient needs testing.