Add currencies XDR and XXX for IMF and "no-currency" (#504935)

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@16721 57a11ea4-9604-0410-9ed3-97b8803252fd

src/engine/iso-4217-currencies.scm

@@ -205,6 +205,9 @@
 ( "Zambian Kwacha" "kwacha" "ngwee"  "ISO4217" "ZMK" "894" 100 100 )
 ( "Zimbabwe Dollar" "dollar" "cent" "ISO4217" "ZWD" "716" 100 100 )
 
+( "Special Drawing Rights" "SDR" "SDR" "ISO4217" "XDR" "960" 1 1 ) ;; International Monetary Fund
+( "No currency" "" "" "ISO4217" "XXX" "999" 1 1000000 )
+
 ( "Gold" "ounce" "ounce" "ISO4217" "XAU" "959" 1 1000000 )
 ( "Palladium" "ounce" "ounce" "ISO4217" "XPD" "964" 1 1000000 )
 ( "Platinum" "ounce" "ounce" "ISO4217" "XPT" "962" 1 1000000 )