Alarm handling with AMSG - #52
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This PR incorporates and expands on #48
In dbrec.c, I have added a third parameter 'amsg' to the call, defaulting to None.
Use of the 'z' argument means that either a string or None is accepted.
If it is None, NULL is the resulting C value.
If EPICS_VERSION is < 7.0.6, the parameter is ignored.
In ptable.py, the stat field is initialised to UDF_ALARM.
This will be overridden if the PINI field is "YES".
This ensures the value of the field matches the actual output value after initial processing.
The alarm, stat and amsg values are applied to both input and output records. This requires the record be scanned in order to update the status.
(My project need is to alert the user when an incorrect value is set that does not meet complex validation rules.)
In test_db.py, I have added tests to verify correct operation of both input and output record alarms.