Use adapted D3 palette as default

... instead of IDS department colours, which could be misleading.

Also add "poly20" palette and make "grey" palette usable from for ggplot2

Change-Id: Ic31cb5ecf881e232d3fc9209b63b19b8705a40b8
diff --git a/man/ids_pal.Rd b/man/ids_pal.Rd
index 96c9313..0bbe8fb 100644
--- a/man/ids_pal.Rd
+++ b/man/ids_pal.Rd
@@ -7,7 +7,7 @@
 ids_pal(palette = "default")
 }
 \arguments{
-\item{palette}{\code{c("D3", "default")} - use default or (adapted) d3 palette}
+\item{palette}{\code{c("d3", "grey", "ids", "poly20")} - default: (adapted) d3 palette}
 }
 \description{
 IDS color palette