CP_APR: Improve loglikelihood_row dense case
#176
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* On my machine this is 10x faster and logically equivalent
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When looking at the tutorial stuff I noticed how painfully slow pdnr was. On my machine this change reduced the runtime for the pdnr solve in the tutorial from 300s to 20s (a profile showed 90% of the time spent in this subproblem). The change should maintain the same logic, and space complexity so there shouldn't be any tradeoffs for the change.
Addresses #164