* Moving get_search_results_map from internal gui to generic navit functions
* Moving square_shape_str() and populate_search_results_map() in generic files (not making them gui_internal-specific)
* Adding GList cleanup after adding search results to a map, setting result names properly in GTK POI
* Using common navit_populate_search_results_map() in internal GUI (factorizing code)
* Adding doxygen comments
* Reverting added empty lines
* Applying expected style (indentation)
* Adding dedicated code to free payload for GList (instead of using unavailable g_list_free_full())
* Avoiding for loop initial declarations
* Remove obsolete FIXME comment
* Minor tweaking doxygen comments and variables
* Removing highlighted points on result map when starting routing