First introduction of news_biztoc — A new partnership with BizToc.com

[marban]

Description

Introduces the first set of features for news_biztoc, following a new partnership with BizToc. Available at launch:

• News / latest
• News / per source
• News / search
• News / tag
• Tags / list
• Sources / list

TBD:

• News / hot
• News / page

See https://api.biztoc.com for details.

Others

• [X] I have performed a self-review of my own code.
• [X] I have commented my code, particularly in hard-to-understand areas.