Improve readability of tests

[ngraymon]

Replace stuff like

with

and replace stuff like

with (something like this)

[ngraymon]

if naming non zero t's / h's etc.. just use a monotonic naming sequence, something plain like 'A,B,C,D'

so maybe `omega^2_1 * t_1 * t_1 * h_1 * z^2 you could just do

t_A = et.big_func_name(a_whole_lotta_args)
t_B = et.big_func_name(a_whole_lotta_args)
t_perm = (t_A, t_B, )