Wooden boats share their past and return to the sea under hands that love them James Hebert STAFF WRITER   PUBLICATION: San Diego Union-Tribune, The (CA) SECTION: LIFESTYLE DATE: August 5, 2001 EDITION: 1,2,3 Page: E-1 Forget sailing over the bounding main. The vessel that sits outside C.F. Koehler's office window looks as if it's bound mainly for the landfill. "You take a look at that boat out there," Koehler admits, "and you say: 'Firewood. Is there a Dumpster big enough f