Added more file descriptions.

compatibility/2.3.nom

@@ -1,4 +1,7 @@
 #!/usr/bin/env nomsu -V2.5.4.3
+#
+    This file defines upgrades from Nomsu <2.3 to Nomsu 2.3
+
 use "compatibility/compatibility.nom"
 
 upgrade action (%a = %b) to "2.3" as (%a == %b)

compatibility/2.4.nom

@@ -1,4 +1,7 @@
 #!/usr/bin/env nomsu -V2.5.4.3
+#
+    This file defines upgrades from Nomsu <2.4 to Nomsu 2.4
+
 use "compatibility/compatibility.nom"
 
 upgrade %tree to "2.4" as:

compatibility/2.5.nom

@@ -1,4 +1,7 @@
 #!/usr/bin/env nomsu -V2.5.4.3
+#
+    This file defines upgrades from Nomsu <2.5 to Nomsu 2.5
+
 use "compatibility/compatibility.nom"
 
 upgrade action (for %1 where %2 matches %3 %4) to "2.5" as (..)

compatibility/2.nom

@@ -1,4 +1,7 @@
 #!/usr/bin/env nomsu -V2.5.4.3
+#
+    This file defines upgrades from Nomsu 1 to Nomsu 2
+
 use "compatibility/compatibility.nom"
 
 upgrade %tree to "2" as:

compatibility/compatibility.nom

@@ -1,4 +1,8 @@
 #!/usr/bin/env nomsu -V2.5.4.3
+#
+    This file contains code for defining ways to upgrade code between different versions
+    of Nomsu.
+
 use "lib/os.nom"
 
 %UPGRADES = {}