Alternative sprinkler control program.

This is alternative sprinkler control program, it works with the same
hardware (standard Arduino Mega, standard Ethernet, 1602 LCD etc).

Core program is the code from Richard Zimmerman, I added local UI -
files LocalUI.cpp, LocalUI.h and keys.cpp, as well as did some minor
modifications of the core code to hook it up. Please see readme.txt for
details.