-if the extension is .sql it is ran on the planetlab4 database
-otherwise it is run as is
-
-See myplc/plc.d/db for how this is used
+Another assumption is that
+ * nnn-up- script will set subversion number to <nnn>
+ * nnn-down script will set subversion number to <nnn>-1
+
+===
+See the migration script in plc.d/db for how this is used
+===