Log message

• CSV Import Field Mapper
- added UPDATE method which allows to configure an import statement à la:
UPDATE t1 SET col1=foo1, col2=foo2 WHERE col3=baz1 AND col4=baz2
- Insert remaining rows (which are not matched) isn't implemented yet
- note: further tests are needed to ensure it works as expected

	Modify	/trunk/Source/SPFieldMapperController.m	diff
	Modify	/trunk/Source/TableDump.h	diff
	Modify	/trunk/Source/TableDump.m	diff