Recent news affecting co-op / condo buyers, sellers, boards and residents. This week, one of the city's biggest landlords enacts one of the largest smoking bans in the country, with reverberations for co-ops and condos. A shareholder sues a co-op board over a newly blocked view. A veterans' loan-guarantee program, common throughout the country, gets no respect in New York. And married co-op and condo owners are taking in roommates,