Made some more changes to the way namespaces are handled, for optimization purposes. This is a bit of a structural reorganization: $paths->pages is obsoleted in its entirety; calculating page existence and metadata is now the job of the Namespace_* backend class. There are many things in PageProcessor that should be reorganized, and page actions in general should really be rethought. This is probably the beginning of a long process that will be taking place over the course of the betas.

/*
 * Auto-completing page/username fields
 * NOTE: A more efficient version of the username field is used for Mozilla browsers. The updated code is in autofill.js.
 */

//
// **** 1.1.5: DEPRECATED ****
// Replaced with jQuery-based mechanism.
//