First stab at denerdifying search criteria. See Issue 348.

Privilege searching on the Users panel can now be performed by privilege number and/or localised privilege name. Multiple entries can be retrieved by comma-separating the priv criteria.

Filtering by yes/no columns on the Section panel is also more human friendly: filter by 'truthy' things like 1, true, yes (localised); or 'falsy' things like 0, false, no (localised); or any unique substring thereof.

Although the core does not implement case sensitive searching at present, the multiCompare() function does. Plugin authors may employ the function flags to configure comparison behaviour.

This feature may be expanded as the search tools are improved across the admin side. No doubt the function can be further extended/optimised as well.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5296 2fea6a4d-a838-0410-917b-93a53c48e9d2