character_table_G.at

the list |G2_class_words| of conjugacy class representatives is fixed in
class_tables.at, and |character_table_G@RootDatum| will produce a
corresponding |[WeylElt]|; the character data below follow this ordering.
The numbering (and naming) of the $W(G_2)$ irreducibles is fixed (locally) in
|character_table_G@RootDatum| below, so we can define data relative to this
numbering. The result is a valid table for any $G_2T_k$ type root datum.