Database Support for "Online" Artists and Artist Search

[xHergz]

Description:

Create the database components to allow artists to set themselves as online, and artists to be searched by online status and geolocation.

Tasks:

• [x] Create table for online artists
• [x] Create function to check if artist is online
• [x] Create function to calculate distance between coordinates
• [x] Create procedure to add an entry to the online artists
• [x] Create procedure to remove an entry from the online artists by artist id
• [x] Create procedure to search online artists

  Tests:

• [x] Function checks if artist portfolio id is online
• [x] Function calculates distance between coordinates
• [x] Procs successfully control online artist
• [x] Proc returns online artist within range