Relationships defined using wrong base field

The relationships that views defines for the core modules use 'field' for the base field but this doesn't match up with what views_handler_relationship defines:

 * - base: The new base table this relationship will be adding. This does not
 *   have to be a declared base table, but if there are no tables that
 *   utilize this base table, it won't be very effective.
 * - base field: The field to use in the relationship; if left out this iwll be
 *   assumed to be the primary field.

I'm guessing that since it's joining on the base table's primary field this error was masked. I noticed it after copy pasting the code into another module that used a non-primary field.

The patch also fixes some spelling errors I noticed and my editor removed some trailing whitespace.