[meteo-vm2-to-bufr] Preserve data when value is out of range

[edigiacomo]

Now, a value out of range is ignored:

$ echo "201701010000,1,160,-1,,,100000000" | meteo-vm2-to-bufr
1:[201701010000,1,160,-1,,,100000000] - Value -1 is outside the range [-0.1,1638.1] for B13011 (TOTAL PRECIPITATION / TOTAL WATER EQUIVALENT)

We should implement the behaviour of dbavm (in pseudocode):

if is_out_of_range(value) {
    if not is_out_of_range(0) {
        value = 0
    } else {
         value = avg(range[0], range[1])
    }
    attributes.append(B33196=0)
}

I'm not quite sure that B33196=0 is right: in the original code a comments says "Mark as replaced", but B33196=1 is "Manual invalidation" (note that the value is 1) and B33197 is "[SIM] Manual replacement in substitution".

[edigiacomo]

@pat1 confirmed that the behaviour should be:

if is_out_of_range(value) {
    if (value > maxvalue) {
        value = maxvalue
    } else {
        value = minvalue  
    }
    attributes.append(out_of_range_attribute())
}

We must define which attribute and which attribute value out_of_range_attribute() will return.

[edigiacomo]

This issue is still relevant.