~jaro/balkon

ref: e2944b4d2ba4dce2e447dc32505597c0cd0519b6 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.