Decimal config not used when running in cron scope

[juhanihaapala]

If price calculations are done in crontab scope the configured decimal is not used.

I fixed the issue based on #42 in my fork and was about to make pull request, but then realized there is in total 8 different scopes so maybe this is not correct way to fix the issue.

[lillik]

@juhanihaapala please pull your code to be merged. Thanks a lot for your help @juhanihaapala and @zamoroka