NZ RWT Tax Rates; update New Company wizard to reflect

The Tax Categories added for New Zealand in the New Company wizard have been updated.

The full list added is shown below:

NR10, Non-Resident 10%
NR15, Non-Resident 15%
R10.5, Resident Low
R17.5, Resident Mid
R30, Resident High
R33, Resident Top
RC28, Resident Company from 1/4/2011
RC30, Resident Company until 31/3/2010
RC33, Resident Company
RE, Resident Exempt