add meta-data mappings

map:
* display.description to DESC
* display.format based on PREC
* valueAlarm.*Limit based on alarm limits

format is always empty if qsrvDisableFormat=1
which is the default as I worry that
clients will this printf() spec is unfortunate ways.

iocBoot/ioccircle/circle.db

@@ -16,6 +16,16 @@ record(calc, "circle:angle") {
   field(INPA, "circle:angle NPP")
   field(INPB, "circle:step NPP")
   field(INPD, "360")
+  field(DESC, "Angle")
+  field(EGU , "deg")
+  field(LOLO, "45")
+  field(LOW , "135")
+  field(HIGH, "225")
+  field(HIHI, "315")
+  field(LLSV, "MAJOR")
+  field(LSV , "MINOR")
+  field(HSV , "MINOR")
+  field(HHSV, "MAJOR")
   field(CALC, "C:=A+B;(C>=D)?C-D:C")
   field(FLNK, "circle:x")
   field(PREC, "3")