Replace fixed-sized comment strings with dynamic strings

include/epanet2.vb

@@ -4,7 +4,7 @@
 'Declarations of functions in the EPANET PROGRAMMERs TOOLKIT
 '(EPANET2.DLL) for use with VB.Net.
 
-'Last updated on 02/28/2019
+'Last updated on 03/17/2019
 
 Imports System.Runtime.InteropServices
 Imports System.Text
@@ -88,6 +88,13 @@ Public Const EN_MAXHEADERROR = 2
 Public Const EN_MAXFLOWCHANGE = 3
 Public Const EN_MASSBALANCE = 4
 
+Public Const EN_NODE = 0          ' Component types
+Public Const EN_LINK = 1
+Public Const EN_TIMEPAT = 2
+Public Const EN_CURVE = 3
+Public Const EN_CONTROL = 4
+Public Const EN_RULE = 5 
+
 Public Const EN_NODECOUNT = 0     'Component counts
 Public Const EN_TANKCOUNT = 1
 Public Const EN_LINKCOUNT = 2