Pdoc

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- New search widget (config tunable `search_query`) using Google CSE.
- Support type annotations for variables (third time's the charm).
- Fix crash on `Module.is_namespace` given a dyunamic/generated module.

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- New features:
- Whitelisting `_private` members with `__pdoc__[key] = True`.
- Support function signatures (and annotations) for Python built-in/C extension types.
- Show type annotations also for variables (some; no instance variables).
- Consult `__docformat__` variable in the documented module (PEP 258).
- Skip traversal of `__pdoc__`-ignored package/directory.
- HTML sidebar (index) now has a separate scrollbar.
- Changes:
- Improved reference linking in more complex type expressions.
- `show_type_annotations` config tunable is now set by default.
- Fixes:
- Fix crash when some `class.__module__` is None.
- Avoid URL manipulation inside code blocks.
- Improved doctests and googledoc docformat.

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- Fix docstrings for class variables inherited from object/builtins values.
- Fix: In HTML output, never link function parameter names to
outer-scope identifiers.
- Fix regression with relative directory paths introduced in 0.7.3.

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- Fix regression introduced in 0.7.0: Hide private instance variables even
when they have PEP 224 docstrings.

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- Sort subclasses for cross-platform consistency.
- Support brace-expanded parameters in docstrings (e.g. `{x,y}_partial`).
- Fixes:
- Document compiled/bytecode modules.
- Fix exception when `__pdoc__`-hiding docstrings for inherited members.
- Determine class instantiation parameters by reading the signature
of class itself, not of its `__init__`.
- Prevent trailing single quote in string (i.e. forward-declared)
type annotations.
- Fix backtick references following fenced code blocks.
- Allow wrapped lines in "See Also" numpydoc section.

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- Fix regression bug introduced in v0.7.1.