~jaro/balkon

ref: 0552e4817ad8e6eb582920c72dd62dc0dd50bfb4 balkon/test/Data/Text/ParagraphLayout/RectSpec.hs -rw-r--r-- 955 bytes
Make paragraphRect origin always 0,0.

This convention should make it easier for the caller to properly place
the paragraph within a document.
Add module for working with rectangle coordinates.