Paper Export Options

[coatless]

Feature:

Given a ts.model object filled in with parameters, it would be nice to export that into latex table form with appropriate spacing.

E.g.

AR1(phi=0.8, sigma2 = 0.01) + WN(sigma2 = 1)

\begin{table}[ht]
\centering
\begin{tabular}{rll}
  \hline
 & 1 & 2 \\ 
  \hline
1 & $\phi_{(1)}$ & 0.8 \\ 
  2 & $\sigma_{(1)}^2$ & 0.01 \\ 
  3 & $\sigma^2$ & 1 \\ 
   \hline
\end{tabular}
\end{table}

Complications:

1. Spacing terms (see @coatless/balamuta 's nb2latex)
2. Missing parameters (imu model selection has different models, thus need to find an LCD model from selected models)