races.2da: added a CANDUAL column to externalise dualclassability
pst: fixed alignment of races.2da
pst::races.2da: added missing value for JAMES_BIRD

in case the table ever needs extending
iwd2::races.2da: fixed alignment for legibility
CanDualClass: allow any race enabled in races.2da to dual class

did you know Viconia is a candidate?