calcAcceptProb: Calculate the acceptance probability for a preposal, whilst...
In hhau/rjmonopoly: Order Selection of Monotonic Polynomials via Reversible Jump

Calculate the acceptance probability for a preposal, whilst enforcing monotoncity.

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calcAcceptProb(gamma_prop, gamma_curr, d_prop, d_curr, d_min, d_max, var_prop,
  var_curr, Q_full, full_inits, y_vec, innov_sigma, dim_prior_vec,
  innov_sd_var = innov_sd_var, R_inv_full)

`gamma_prop`	Vector containing proposal for Gamma
`gamma_curr`	Vector containing the current value for Gamma
`d_prop`	proposed polynomial degree
`d_curr`	current polynomial degree
`d_min`	minimum allowable polynomial degree
`d_max`	maximum allowable polynomial degree
`var_prop`	proposed variance
`var_curr`	current variance
`Q_full`	Full size (n_obs * (d_max + 1)) matrix for Q
`full_inits`	full set of initial gamma values from the MonoPoly::monpol fit
`y_vec`	Vector of y observations
`innov_sigma`	innovation variance that pertains to the gamma proposal
`dim_prior_vec`	Vector containing prior values for our dimension parameter
`innov_sd_var`	innovation variance pertaining to the variance proposal
`R_inv_full`	Full size (d_max + 1) * (d_max + 1) basis inverse matrix