* IDEMPIERE-4066: Adding 'Relative Period To' on financial report column which allow to specify period range to produce YoY. QoQ like comparision report.
* IDEMPIERE-4066: Fixing defaulting RelativePeriodTo to Null issue
* IDEMPIERE-4066: Fix as per Carlos review.
1. Fixing compilation issue
2. Moving Column ID constants to systemIDs
3. Updating serial version for MReportColumn.
* IDEMPIERE-4066: Reverted GridField class changes and configured defailt for RelativePeriodTo to be 'NULL'
Deepak Pansheriya