Stable release

Changes

• New SIP TCP mode
• New -b flag to set your own DHT bootstrap node (default: bootstrap.sentrypeer.org:4222)
• Error handing for -p flag if OpenDHT support is not compiled in
• Debug mode now shows what OpenDHT-C library version we're using
• Debug mode for p2p now shows the correct event_uuid when checking for duplicate events
• Coverity scan fixes

Tests

• New tests for sip_message_event type and related functions