replacing tmvtnorm with TruncatedNormal

[istfer]

Description

I was using tmvtnorm package functions in PDA module, but I realized that it is veery veery slow. I'm planning to switch to TruncatedNormal.

Depending on the value of the B argument (number of replications for MC) in its TruncatedNormal::dtmvnorm function, it can be much faster than tmvtnorm::dtmvnorm. To be specific, the default value for B is 1e4 which makes TruncatedNormal::dtmvnorm even slower than tmvtnorm::dtmvnorm, but setting it to 1e2 is much faster. tmvtnorm::dtmvnorm is more precise than TruncatedNormal::dtmvnorm (when B=1e2), but it matters on the 2nd decimal place, which is fine for my purposes.

If there is no objection, I'm gonna replace tmvtnorm with TruncatedNormal.