Add search feature to the File system repository

Create a directory A in moodledata/repository Load the directory with files and folders Use several level of depth Use complex file names (special characters, spaces, ...) Create a new instance of the File System repository pointing to A. Browse the repository and make sure it works as expected: you can browse and save files. Also confirm that the breadcrumb is fully functional Use the search and confirm that it finds the relevant results. Confirm that more results load automatically (every 50 hits) Confirm that you can go in sub directories and go back to search results (breadcrumb) Confirm that you can download files from the search results Note: Symlinks are not supported.