Updates to DRS_Contact_CTRL
Updates to DRS_Contact_CTRL

- Added logic to display first contact of every DRS record
- Logic to display Contact list related to the selected DRS record is added.
- Contact merge logic is replicated from CON_ContactMerge_CTRL class as the related methods are declared private in CON_ContactMerge_CTRL class and could not be called from this class.
SalesforceFoundation/Cumulus,SalesforceFoundation/Cumulus,SalesforceFoundation/Cumulus,SalesforceFoundation/Cumulus