Allow searching for works with page images in the browse list.

[Philip Burns]

We would like to allow selecting texts with available page images in the work browser.

This is most easily accomplished by checking if the text contains one or more facsimile elements, adding "has page images" search field to the work browser filter dialog, and ensuring the "has page images" flag is indexed with the other work-based metadata.

In addition, the availability of page images ishould appear in the work browse display.

Pib has an sample implementation.

[Philip Burns]

Emhancement added repository code.