Bump version to 2.0b2.
Convert "_" in HTML attr names to "-".

Trailing "_" is still deleted as before.
Delete 'highlighter' arg in 'highlight()'.
Move auto_link() implementation to private module.
Merge 'html.converters' module into 'html.tools'.
Doc wording.
Delete 'format_number'.

Use Python's string-formatting methods: "{:,}".format(12345) or
"{:n}".format(12345).
Delete the stats container classes.

Delete ``Stats`` and ``SimpleStats`` classes but keep the individual statistic
functions intact.
Delete ``required_legend``.
Delete 'required_legend'.
Rename 'del_quiet' to 'del_keys' and change args.
Delete 'get_many'.
'format_paragraphs' should return a literal.
Changelog.
Rename 'extract_keys' to 'dict_split'.
Bump version to 2.0b3.
Move/rename several text-html rendering helpers.

Rename 'format_paragraphs' to 'text_to_html'. Re-expose 'render' and rename it
to 'html_to_text'. Re-expose 'sanitize'. Rename the 'render' private module to
'_render'.
Delete 'all', 'any', 'no'.
Rename 'convert_or_none' to 'convert'.
Delete disabled 'commit_misc_characters'.

This helper has been disabled since WebHelpers 1 due to failing tests and
uncertainty about what it should do.