Fixed #12690 -- Fixed SQL template used for Oracle's with `SDO_RELATE`...

Fixed #12690 -- Fixed SQL template used for Oracle's with `SDO_RELATE` function, added `truncate_params` attribute to spatial backend, and re-enabled the `relate` lookup tests.  Thanks, jtiai, for the bug report.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@12300 bcc190cf-cafb-0310-a4f2-bffc1f526a37