Merge branch 'feature/113-SystemDb-SystemDb_Ext-missing' of https://github.com/kirchsth/C4-PlantUML into master

C4_Context.puml

@@ -218,6 +218,14 @@ rectangle "$getSystem($label, $descr, $sprite)$getProps()" $toStereos("system",
 rectangle "$getSystem($label, $descr, $sprite)$getProps()" $toStereos("external_system", $tags) as $alias
 !endprocedure
 
+!unquoted procedure SystemDb($alias, $label, $descr="", $sprite="", $tags="")
+database "$getSystem($label, $descr, $sprite)$getProps()" $toStereos("system", $tags) as $alias
+!endprocedure
+
+!unquoted procedure SystemDb_Ext($alias, $label, $descr="", $sprite="", $tags="")
+database "$getSystem($label, $descr, $sprite)$getProps()" $toStereos("external_system", $tags) as $alias
+!endprocedure
+
 ' Boundaries
 ' ##################################