Add stats view: "Disjointed/Unique Keywords"

[Daniel Hahler]

There is a "Keywords" view in "Search B-hits" already [1], but this uses the whole query.

I'd like to have a view, with those keywords split into single words, i.e. given the following queries:
 mysql bzr
 mysql oracle
 "blog tool" MySQL

This would have 3 hits for "mysql", and one for "bzr", "oracle" and "blog tool" (or "blog" and "tool").

The question is, if phrases should be kept as-is, or also split into words (i.e. one hit for both "blog" and "tool", but none for "blog tool").

Maybe just strip any special chars (like "+", "-", and quotes), then split by words.

[1] http://test.b2evolution.net/HEAD/blogs/admin.php?blog=14&ctrl=stats&tab=refsearches&tab3=keywords&locale=en-US&login=admin&pwd=demopass