Do not re-export through the Plain module.

Move paragraphSpanBounds to the correct module.

Clarify comment about BiDi.

Correct comment about fragmentation.

Fix style: long lines.

Fix style: small Prelude imports.

Fix style: external vs internal imports.

Fix style: unnecessary do notation.

Fix style: white space in lambdas.

Fix style: white space around operators.

Fix style: white space in multi-line lists.

Fix style: white space in exports and imports.

Fix style: bullet points in comments.

Fix style: non-ASCII characters in comments.

Fix style: remove duplicate spaces.

Mark some lists as explicitly non-empty.

Fix typos in comments.

Bump version to 0.2.1.1.

Set release date for v0.2.1.0.

Fix data types in harfbuzz-pure.