Add epanet input schema

sql/section_create/2.junctions.sql

@@ -0,0 +1,9 @@
+-- [JUNCTIONS]
+
+CREATE TABLE JUNCTIONS
+(
+  ID VARCHAR(32) PRIMARY KEY REFERENCES _NODE(ID)
+, Elevation NUMERIC NOT NULL
+, Demand NUMERIC
+, Pattern VARCHAR(32) REFERENCES _PATTERN(ID)
+);