Applied patch from jira issue - OFBIZ-5630 - service updateFxConversion doesn't set thruDate properly.
==========================================================================================
When updating an existing foreign currency exchange rate in accounting the service creates a new exchange rate and sets the thruDate of the old rate.
But in stead of taking the fromDate of the new exchange rate as a starting point for the thruDate of the expired exchange rate it uses nowTimeStamp.
==========================================================================================
Thanks Pierre for reporting the issue. Thanks Pranay for providing the fix. 


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1639848 13f79535-47bb-0310-9956-ffa450edef68