first version of dividend performance analysis

new sidebar entry shows a list of all current securities, which has at least one dividend payment

- can handle multiple  buys and sells
- shows the "regular" irr from the security perfomance view
- the cost-based dividend-irr 
- trys to analyse the periodicity of payments
- from the last 12 month: total income and the return rate based on cost
- expected income bases on current shares
- if there is a continuous increase of  the return rate for at least 3 years: the expected income in 10 years