posterdown_memoir phased to posterdown_pdf

Fully-ish customised sizing of the poster and colours :partly_sunny:
diff --git a/.Rproj.user/441ADA46/pcs/source-pane.pper b/.Rproj.user/441ADA46/pcs/source-pane.pper
index 70829f6..3249574 100644
--- a/.Rproj.user/441ADA46/pcs/source-pane.pper
+++ b/.Rproj.user/441ADA46/pcs/source-pane.pper
@@ -1,3 +1,3 @@
 {
-    "activeTab" : 1
+    "activeTab" : 2
 }
\ No newline at end of file