• most errors are shown as toast messages
• error toasts can be toggled in Settings -> User interface -> Show error toasts (default to true)
• toast messages (error or not) are cached for the session and can be shown in Logs screen
  • this is true even "Show error toasts" is turned off
• most error logcat messages are turned off for the release app
• added a setting to toggle logging of all debug messages in Settings -> User interface -> Print debug logs (default to false)
• updated some deprecated routines in NetworkUtils
• set refresh failure backoff criteria to 25% of refresh interval
• in Search screen, previous search term and results are preserved (for the session) in all cases
• fixed some discrepancies of the default values between the Settings and the usage
• consolidated handling of default values in preferences