Bugfixes for parallel and estimation

With use_mh_covariance_matrix we do not load previous simulations, but only base the proposal density on a previous run; so skip the display.

options_ is missing as an input argument for compute_posterior_covariance_matrix

1. 'fGlobalVar' was misspelled
2. Removing the eval crashes the parallel option as global variables are not passed correctly. Because it originally was an assignment where the variable named options_ was assigned to fGlobalVar.options_, but after 47af0cdewe only assign the string 'options_' stored in GlobalNames{j}.