Updated Peristance layer to use the new error_hanler based on EWF error library.

Remove once use from DATABASE_ERROR_HANDLER.
Initial support transaction handling.

persistence/implementation/common/database/error/database_no_change_error.e

@@ -0,0 +1,27 @@
+note
+	description: "Summary description for {DATABASE_NO_CHANGE_ERROR}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	DATABASE_NO_CHANGE_ERROR
+
+inherit
+	DATABASE_ERROR
+		redefine
+			make_from_message
+		end
+
+create
+	make_from_message
+
+feature {NONE} -- Init
+
+	make_from_message (a_m: like message; a_code: like code)
+			-- Create from `a_m'
+		do
+			make (a_code, once "Database No Change Error", a_m)
+		end
+
+end

persistence/implementation/common/database/error/shared_error_handler.e

@@ -1,39 +0,0 @@
-note
-	description: "Shared error handler for database"
-	date: "$Date: 2013-08-08 16:39:49 -0300 (ju. 08 de ago. de 2013) $"
-	revision: "$Revision: 195 $"
-
-class
-	SHARED_ERROR_HANDLER
-
-inherit
-
-	SHARED_LOGGER
-
-feature -- Access
-
-	database_error_handler: DATABASE_ERROR_HANDLER
-			-- Error handler.
-		once
-			create Result.make
-		end
-
-feature -- Status Report
-
-	has_error: BOOLEAN
-			-- Has error?
-		do
-			Result := database_error_handler.has_error
-		end
-
-feature -- Helper
-
-	exception_as_error (a_e: like {EXCEPTION_MANAGER}.last_exception)
-			-- Record exception as an error.
-		do
-			if attached a_e as l_e and then attached l_e.trace as l_trace then
-				database_error_handler.add_error_details (l_e.code, once "Exception", l_trace.as_string_32)
-			end
-		end
-
-end