* Complete typographic overhaul.
* Removed all section level indentation since it does not affect
output formatting, but might affect source code examples.
* In text-mode stripped out all tabs which had crept in and replaced
them with four spaces.
* Updated all code examples (again) to conform with Python-mode.
* Bumped version number in preparation for next release of GPG 2.2.9
and corresponding GPGME release.
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