Move the search module files to their new homes (rename-only commit).

--HG--
rename : modules/search/controllers/search.php => modules/search/classes/Search/Controller/Search.php
rename : modules/search/helpers/search_event.php => modules/search/classes/Search/Hook/SearchEvent.php
rename : modules/search/helpers/search_installer.php => modules/search/classes/Search/Hook/SearchInstaller.php
rename : modules/search/helpers/search_task.php => modules/search/classes/Search/Hook/SearchTask.php
rename : modules/search/helpers/search_theme.php => modules/search/classes/Search/Hook/SearchTheme.php
rename : modules/search/models/search_record.php => modules/search/classes/Search/Model/SearchRecord.php
rename : modules/search/helpers/search.php => modules/search/classes/Search/Search.php
rename : modules/search/views/search_link.html.php => modules/search/views/search/link.html.php
rename : modules/search/views/search.html.php => modules/search/views/search/results.html.php
Fix the search module class declarations.
Add the search module transparent-extension-enabling files.
Search and replace in search module (87 places).
Merge pull request #243 from shadlaws/k3_search_module_translate

K3 search module translation.