Added a number of auxiliary Makefiles

- MakeScaler.RHEL7 to build the EPICS scaler module from source. We use a better one then the standard one.
- MakeAutoSave.RHEL7 to build  autosave from the PSI module system
- Modified the EL734Driver to set the MsgTxt to NULL when everything is happy

MakeScaler.RHEL7

@@ -0,0 +1,17 @@
+include /ioc/tools/driver.makefile
+
+MODULE=scaler
+
+BUILDCLASSES=Linux
+
+USR_DEPENDENCIES = asyn,427.0.1
+
+SOURCES += stdApp/src/scalerRecord.c
+SOURCES += stdApp/src/devScalerAsyn.c
+SOURCES += stdApp/src/drvScalerSoft.c
+
+HEADERS += devScaler.h
+
+
+DBDS += stdApp/src/scalerRecord.dbd
+DBDS += stdApp/src/scalerSupport.dbd