Fix missing callbacks. Initialize waveforms.

asyn READBACK tag allows for waveform record to be updated whenever the
callback is called in code.

Without this, OPIs usually can't properly put or get to uninitialized
waveform records.

vmmTblApp/Db/channels.template

@@ -11,6 +11,8 @@ record(aao, "$(P)$(R)$(HYB)$(VMM)$(C)$(CH)-S") {
     field(FTVL, "CHAR")
     field(FLNK, "$(P)$(R)$(HYB)$(VMM)$(C)$(CH)-R")
     field(OUT,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))HYB_$(HYB)_$(VMM)_$(CH)")
+
+    info(asyn:READBACK, "1")
 }
 
 record(aai, "$(P)$(R)$(HYB)$(VMM)$(C)$(CH)-R") {

vmmTblApp/Db/vmm.template

@@ -7,6 +7,8 @@ record(aao, "$(P)$(R)$(HYB)$(VMM)$(C)$(CH)-S") {
     field(FTVL, "CHAR")
     field(FLNK, "$(P)$(R)$(HYB)$(VMM)$(C)$(CH)-R")
     field(OUT,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))HYB_$(HYB)_$(VMM)_$(CH)")
+
+    info(asyn:READBACK, "1")
 }
 
 record(aai, "$(P)$(R)$(HYB)$(VMM)$(C)$(CH)-R") {
@@ -29,6 +31,7 @@ record(ao, "$(P)$(R)$(HYB)$(VMM)$(C)All$(CH)-S") {
 record(acalcout, "$(P)$(R)$(HYB)$(VMM)$(C)#All$(CH)-S") {
     field(NELM, "64")
     field(OOPT, "On Change")
+    field(CALC, "A")
     field(INPA, "$(P)$(R)$(HYB)$(VMM)$(C)All$(CH)-S CPP")
     field(INAA, "$(P)$(R)$(HYB)$(VMM)$(C)$(CH)-S")
     field(OUT,  "$(P)$(R)$(HYB)$(VMM)$(C)$(CH)-S PP")

vmmTblApp/src/vmm_tbl.cpp

@@ -600,6 +600,7 @@ endOfReadInt8Array:
  }
 
   *nIn = nElements;
+  status |= (int)doCallbacksInt8Array(value, nElements, function, 0); 
 
   if (status) {
     asynPrint(pasynUserSelf, ASYN_TRACE_ERROR, "%s:%s: Failed to get paramter %s, index %d.\n", driverName,