Use 'close' quote instead of 'adjusted close' from Yahoo

Adds additional feed provider to use adjusted close.

The historical 'close' typically includes stock splits, while the
'adjusted close' adjusts for dividends and stock splits. The adjusted
close could be of interest when using the investment vehicle as a
benchmark.
Ignore certificate error when downloading consumer price index
Fix NaN in taxonomy definition viewer
Use identical colors for tree map tiles (used to use different shades)
Export all security identifiers (ISIN, WKN, ticker symbol)

Previously only ISIN was exported. This results in warning a message
when importing the same file again because WKN and ticker are missing
(but optional) fields.

Issue: #103
Set proxy authentication as Java ignores http.proxyUser

Issue: #100
Add checkbox to 'check for updates on startup' to update dialog