Use the appropriate locator type instead of a literal "p."

The old approach produced "col. p. 2257" for a citation of column 2257. A test case for
this has been added, and the files have been timestamped.
Cite page number (if available) for dictionary and encyclopedia entries.

Timestamp. I verified that the main style validates.

No new test case is needed, but the yes file changed because it now indicates
the page numbers for two dictionary entries.