Sky Map v2 2.1.2: Artemis

This is the first stable release since 2.0.8 and includes everything from 2.1.0 and 2.1.1 below.

Added

• Searchable Help page, with results that jump straight to the relevant part of the app. (#1068)
• A Widgets menu item opening a shared add-widget sheet, so any of the three home-screen
  widgets can be added from one place instead of only the Moon's info card. (#1065)