With forecasts of massive storms for the next week or two, it behooves me to concoct ways to stay cheerful in the face of gray skies and heavy rains.  At least it's not snow, I say to myself.   Rain speaks to the limitations of life in the Bay Area, whereas sunny days  inspire in me the prospects of unlimited opportunity.  OK:  slight exaggeration -- but I'm already looking forward to the first sunny day after the storms.