[Technical Report] Alertness Calculation needs to use Anticipations

[ccrock4t]

according to "The emotional mechanisms in NARS" (https://cis.temple.edu/~pwang/Publication/emotion.pdf)
alertness summarizes the average difference between recently processed input and the corresponding anticipations, so as to roughly indicate the extent to which the current environment is familiar.

With PR #28 the Global Evaluations of NARS are implemented, though the Alertness calculation is tentative since the system does not yet produce Anticipations.

According to the above text, Anticipations should be used to compute Alertness.