Simplify search match navigation interface

Replace find_previous_pattern() and find_next_pattern() functions with
goto_search_match().  This reflects the way former ones were used.
Merge branch 'one-more-search-module-improvement'

Simplify search match navigation interface

Replace find_previous_pattern() and find_next_pattern() functions with
goto_search_match().  This reflects the way former ones were used.