Ensures that Solr will return available results, even if there are many
misses when using check_access(), by asking Solr for more results if the
counter says there should be more.

Improves performance by ending processing as soon as the requested page
of results is processed. Remaining number of pages is an "estimate"
based on the total result count from Solr and how many items we have
rejected up to this point.

David Monllaó authored Feb 23, 2016 and Dan Poltawski committed Feb 23, 2016

Also content_to_text moved to weblib.

David Monllaó authored Feb 19, 2016 and Dan Poltawski committed Feb 23, 2016

Introducing both APIs in moodle along with:
- search_box widget to add a tiny search box
- admin settings with setup steps helper
- cache for search results
- template for a search result
- php unit stuff

Many thanks to Tomasz Muras, Prateek Sachan and Daniel Neis for their contributions, for starting this development
and for pushing for it to be completed. Also thanks to other contributors: Jonathan Harker and eugeneventer.

Hopefully it will be replaced by something fully functional soon, see http://moodle.org/mod/forum/discuss.php?d=189023

fixes type wilcard issue on add/delete/update cron scripts

used the correct function. Add description comments to files.