* Remove the QR Code error corrections subsection.
* Remove the non-example Payment Protocol text from developer examples.
* Update reference links and autocrossrefs to reflect above deletions
* Fix CSS padding problems reported by @saivann
* Remove all HTML comments from autocrossref text to allow easy checking
for broken link definitions: find _site -name '*.html' | xargs grep '\]\['
* Add PNG versions of guide and example SVG icons. (optipng run)
As suggested by @gmaxwell (thanks!), I tried to make clearer the benefit
of hardened keys:
* Described hardened keys as a solution in the first sentence of the
Hardened Keys subsection.
* Reordered the text so that the problem is described before the
solution, making the presence of a solution clearer.
* Added a prefatory sentence to the description of the two key
derivation formulas again describing the hardened formula as a
solution.
As suggested by @vbuterin (thanks!), I added a paragraph describing that
HD wallets don't use normal derivation on the master key so they don't
have an effective master public key. (See end of the diff.)
This is a fairly large diff because of the reordering, but no new
clauses were added besides those described above.
Thanks also (in alphabetical order) to @cbeams, @mikehearn, and
@tgeller, among others.
The last pre-squash commit was: c2b8d562aa107c7b68c60946cea14cdccc5159ad
