There were 93 gainers and 52 decliners on the main board. (Image: NZME)An earnings upgrade from Vista Group and a significant fall in the oil price provided comfort for the New Zealand sharemarket as the latest reporting season got under way.The S&P/NZX 50 fell to a lunchtime low of 13,673.14 but recovered in the afternoon and closed at 13,774.93, up 75.65 points or 0.55%.There were 93 gainers and 52 decliners on the main board with turnover reaching 28.3 million shares worth $110.1m. 'A great start to the reporting season'Mark Lister, investment director with Craigs Investment Partners, said the V...