have_theorems etc.: handle multiple lists of arguments; added method_setup;

have_thmss: handle multiple lists of arguments;

now freezes Vars in order to prevent errors in cases like these: Goal "Suc (x + i + j) + ?q ?ii ?jj + k + x = xxx"; Goal "Suc (x + i + j) = x + f(?q i j) + k"; Goal "Suc (x + i + j) = x + ?q i j + k"; Goal "Suc (?q ?ii ?jj + i + j) + ?rq ?ii ?jj + k + ?q ?ii ?jj = xxx";

tidied proofs using default rule equalityCE

the default equalityCE simplifies proofs

tidied