~jaro/balkon

ref: 2db7d32290bc20ee29469a9edf0d64d3dbad93c9 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.