Deprecated fetchHTML

Moved into onAugmentFindByLink, this was its only context, which
resulted in simpler code.
Note about rule processing
Correctly reference timeout parameter

Forgot to prefix it, it was never getting set as a result
Removed rewriteLinks parameter to fetch

Links are now always rewritten
Removed augmentImages parameter to fetch

If augmenting entries then images will always be augmented.
Moved some image handling from image.js to fetch.js

The image-related functions are coherent to the fetch purpose and
specific to it, and not generic or used elsewhere, so it made less sense
to have them separate
Deprecated isDataURL

Could not justify the abstraction.
Deprecated lucu.image

Its functionality was specific to fetch.js, so I moved it into fetch.js
and removed image.js. It was pointless abstraction.
Cleanup

Removed the uri2 stuff, it was not working. Minor cleanup in other
functions.
More protocol edge cases