60% acc

As it is now, accuracy is 60 percent.

This was done with several changes.
1. Using log prob consistently
2. Replacing an errant probInstance with correct a_ij = probPair(i , j,
model) call
3. Surprisingly, avoiding tag_max does not  help in probInstance()?

More testing is needed, such as if log prob are helping or hurting, that
I need smoothing to do better than 60%, and I need to account for unseen
tagpairs as well.