"Show more" link not shown on facet blocks provided by other modules

This problem can easily be observed with the ApacheSolr Biblio module, for example.

The "Show more" link gets appended to a facet block through a jQuery selector that relies on the block's ".block-modulename" class attribute. However, apachesolr.js hardcodes the classes ("block-apachesolr" and "block-apachesolr_search"). With this patch, the module names are passed to Drupal.settings and the selector dynamically built using those names.

Alternatively, perhaps one could imagine a different way for selecting the right blocks, without relying on those classes?