Feature: navigate back and forth
Created by: bAndie91
this pr adds a 'View' menu to the main menu with a 'Previous' and a 'Next' menuitems, which displays the previous and next search results respectively.
search results are stored in a global hash by deep-copying $results
reference which display_results()
gets as first argument.
this feature makes more sense with clear_search_list=1
config option.
this pr addresses #215 (closed)