Maintenance: bug fixes for the fine-tuning of output

Maintenance has been carried out for some of the fine-tuning in post-processing following the initial run of Wget.

• more robust handling of Wget --exclude and --include (domain) options
• corrected the position of asset_exclude_dirs in find commands to duly exclude directories
• inserted missing context for regex search to prune links with query strings appended.
• All HTML Tidy errors now append to same file (via stderr)