~jaro/balkon

ref: efcef179a0e0ca9bf126b3b5a32a8094f55faaf5 balkon/lib/Data/Text/ParagraphLayout/Plain.hs -rw-r--r-- 1.7 KiB 
Deprecate the Plain interface.

Add user data to spans.

Add line numbers to laid out fragments.

Qualify Plain interface.