civodul/guile-charting: Local modifications to Andy Wingo's Guile-Charting.

Ludovic Courtès affc16a803 Add missing (ice-9 format) import.		4 lat temu
..
csv.scm	87edeb464a Add write-csv-row impl	5 lat temu
draw.scm	618bc6b56f Use hash-colon keywords.	4 lat temu
prof.scm	affc16a803 Add missing (ice-9 format) import.	4 lat temu
util.scm	618bc6b56f Use hash-colon keywords.	4 lat temu