~jaro/balkon

ref: 6e42cae4509b0d6d9f24bd2887b816ff6e2c5188 balkon/.golden/mixedLanguageLTRParagraph d---------
Make paragraphRect origin always 0,0.

This convention should make it easier for the caller to properly place
the paragraph within a document.
Use top edge for placing lines.
Calculate "normal" line height and pen position.
Upgrade Fragment to contain pen position.
Implement "plain" interface.