Richard Davis, a former Nicasio homeowner and financial advisor who played a pivotal role in the formation of Marin Agricultural Land Trust, died March 25 at age 89. Davis’s work as a financier earned him the reverence of colleagues and many hobbyist investors, who saw in him the unwavering integrity and regard for clients’ needs that could and should epitomize the financial industry. “Dick always did the right thing; he was incredibly honest and he…