Talkie: Add preference to disable notifications
android-daemon: Wi-Fi P2P refactoring

Database and GUI removed completely.
Wi-Fi P2P Manager is activated on every start now.
Scanning for peers is done together with the global discovery scheduler.
android-daemon: Drop Wi-Fi P2P support for Android Version < 4.2

This change simplifies the Wi-Fi P2P handling through relying completely
on service discovery provides by Android Jelly Bean.
android-daemon: Check if switch preference is supported (Wi-Fi P2P)
android-daemon: Add service discovery request right before start discovery (Wi-Fi P2P)
android-daemon: Restart P2P discovery if Wi-Fi P2P is enabled again
android-daemon: Add/remove Wi-Fi P2P service request on start/stop discovery
daemon: Only check timestamp constrains if timestamp > 0
daemon: Remove dead-code
daemon: Remove redundant handling of aborted transfers
android-daemon: Show discovery on/off message as notification ticker
android-daemon: Fix lint warning related to API level HONEYCOMB_MR1
android-daemon: Add discover start/stop button to notification
android-daemon: Prevent discovery stop by timely limited start_discovery intents if discovery is always on
android-daemon: Fix german translation
android-api: Added intent to handle clicks in the neighbor list of the daemon
android-daemon: Send broadcast intent to external app on click on neighbor list items

The previous function "connect" is now in the long click item menu.
DTNExampleApp: Add handler for new neighbor list clicks
Talkie: Add handler for new neighbor list clicks
Talkie: Fix crash on abort recording