Added function get_nll_components to get-results

This pulls all possible likelihood components (specified from ss3.tpl)
from the SS report file. If any likelihood component was not calculated,
it returns NA. the getNLL_components function is then used in the
get_results_scalar function to return all possible likelihood components
from the report file.
Merge branch 'feature/update_get_results'
Minor edits to new get NLL function