~jaro/balkon

ref: d967aa9649fb81cb13f7fb00e5fec774b4dfb7f0 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.