please allow images with absolute paths (starting in '/' or 'http://') to be placed in the --outdir

Version: 1.10-feature
Original reporter: 

Looking to properly 'bundle' images in html pages with htmldoc's '-t html' option, but images with absolute paths are omitted.

Would be great to grab them too, not just relative paths.

Htmldoc gurus, what say you?

Thanks,
Micki
