RFE: Search by references/identifier/description/...

[cipherboy]

Search currently appears to only work by searching for rules titles. If you don't know the title but do know part of the description, reference number (e.g., CIS 1.1.1.1) or identifier (CCE...) it might be nice to be able to search by this as well.

Reference searching is the most difficult as some references are highly duplicated (when you search for '1' what should be returned)? Should we support a reference system prefix? How do we map that onto URIs actually used in the rules' XML? &c.