add compound id in the django admin interface

esp. useful now that compound ids are permanent (cf #51)


Former-commit-id: 3eee58ba2afdb7a62b68eaa569cbdfe3f82747f9

ippisite/ippidb/admin.py

@@ -49,8 +49,7 @@ class MDDRCompoundImport(admin.ModelAdmin):
 
 @admin.register(Compound)
 class Compound(admin.ModelAdmin):
-    list_display = ('iupac_name', 'common_name', 'canonical_smile')
-
+    list_display = ('id', 'iupac_name', 'common_name', 'canonical_smile')
 
 @admin.register(TestActivityDescription)
 class TextActivityDescription(admin.ModelAdmin):