Restructuring and extended postprocessing

This release includes a little refactoring of code and has extended the postprocessing of output from the initial run of Wget (phase 2). It includes support for scheme relative URLs, CORS, and assets with long filenames.

In general, the way assets are determined for localisation is more refined: in particular, with more options to restrict the processing, there should be fewer commissions (or false positives) in transforming absolute URLs to relative URLs.