~jaro/balkon

ref: 4c1db0da368a4d8a2a33ab0d37deef45e99a54d2 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.