Loss of precision for investment type

[kublaikhan]

The print format for price and quantity for Investment is '%s%.3f'. However, Quicken can take a precision of 6 digits after the decimal for price and 4 digits after the decimal for quantity, so when these fields get printed by QIF precision is lost.

I think the custom_print_format should be accessible or at least the default should be '%s%.6f' for price and '%s%.4f' for quantity.