display selected compound in the chart with a bigger dot

so that it can be seen even if another compound has exactly the same position
(see remark from @osperand in #49)


Former-commit-id: 95db8f9cc42341f51028c64986a3fbc8b9e7afaa

ippisite/ippidb/templates/base.html

@@ -120,6 +120,7 @@
                       data: currentFamilyData
                     },
                     { label: 'Compound',
+                      radius: 6,
                       borderColor: "rgba(194, 0, 0, 1)",
                       backgroundColor: "rgba(194, 0, 0, 1)",
                       data: currentCompoundData