issue #19550: Make sure changes to characteristics update pricing.
issue #19550: Add support for question/response notifications regarding pricing. Some tweaks based on Qt code review.
issue #19550: Add priceAsOfDate function.
Merge pull request #103 from jrogelstad/19550

issue #19550: Make sure changes to characteristics update pricing.
Merge remote-tracking branch 'XTUPLE/quote_dev' into 19453e
issue #19453: use priceAsOfDate