Recent Python gives a warning about the \s escape in a string pattern
passed to re.sub(). Apparently this is not supported. Instead, pass a
width of ∞ to yaml.dump() to avoid adding the line breaks in the first
place that the regexp was removing.
* Simplify find_cases
* Improve help text
* Improve YAML-capturing regex
* Use built-in dedenting
* Fix use of built-in dedenting
* Fix use of built-in dedenting for Python 3
* Generation: Use Python 3-compatible imports.
* Generation: Use range() instead of xrange().
* Generation: Use list comprehensions instead of map().
* Generation: Explicitly use bytes in the Test class.
* Generation: Run unit tests on Python 3 as well.
In order to promote readability of the generated test material, the test
generation tool may insert whitespace if the context a given expanded
variable calls for it. Avoid inserting such whitespace within literal
values that span multiple lines.
When inspecting previously-generated files, a new `Test` instance should
be used. This avoids over-writing the in-memory representation of the
latest test, and allows previously-existing test files to be partially
updated according to subsequent changes in their respective source/case
files.
In expecting "case directories" to contain a sub-directory named
"default", the test generation tool is unable to generate tests for
features where a directory named "default" is not appropriate.
Modify the heuristic that identifies "case directories" to use a more
fundamental aspect (i.e. the existence of at least one "case" file).
