Log Message:
Add opencpn-plugin-watchdog version 20160415

This plugin is developed by Sean D'Epagnier and implements various configurable
alarms alerting the user about the changing conditions round the boat.
Watchdog also implements a Deadman-alarm and an improved anchor alarm.
Watchdog communicates with another very useful plug-in, called OpenCPN ODraw
Plugin (opencpn-plugin-draw in pkgsrc). That plugin is a tool to draw
geo-referenced points, lines and shapes within OpenCPN.