* README: A few fixes.
Explain how to install color support.
* README-hacking: Rename as...
* README-hacking.md: this, and convert to Markdown.
Improve typography.
Improve explanations about update-test.
When we update some output format, too many adjustements must be made
by hand. This script updates most tests based on the actual output
made during the tests.
* build-aux/update-test: New.