getNonZeroValueFormat with Int
added Values<Integer>
retrieves #shares and "amountPerShare"  from AccountTransaction
extended view: reliability of dividendIncreasingRate and #years; Expected dividend in 5 and 10 years; Account

todo: weighted mean value if there are multiple dividend payment's
account for portfolio transactions
dividends: trrDiv renamed to totalRateOfReturnDiv
fixed: wrong calculation of mean number of shares
debugStop moved to class Helper
DividendPerformance: to handle dividend payment as extra payment, simply set number of shares to zero. The payment stays in calculation of the dividend internal rate of return, but will be ignored in all calculations for regular and future payments. Now: even negative increasing rates are visible, so you can identify your dividend loosers. Expected payments are now calculated for then next five AND ten years, with only the "safe" part of the increasing rate.