EPICS7 support

[pipp-p]

It would be good to make S7PLC module to support EPICS7.
For my work I just updated these lines in two files:

../s7App/devS7plc.c
@@ -2331,7 +2331,7 @@ 
-#if (EPICS_REVISION>=14)
+#if (EPICS_REVISION>=14  || EPICS_VERSION>3 )
/* calcout **********************************************************/
 STATIC long s7plcInitRecordCalcout(calcoutRecord *record)

../s7App/drvS7plc.c
@@ -264,7 +264,7 @@ 
-#if (EPICS_REVISION>=14)
+#if (EPICS_REVISION>=14 || EPICS_VERSION>3)
static const iocshArg s7plcConfigureArg0 = { "name", iocshArgString };