[pcp] pmval does not print negative values (#67)

[Rares Vernica <notifications@xxxxxxxxxx>]

I modified the acme.c example provided in the Programmer's Guide and here do generate negative numbers.

When reading the values produced, pminfo displays the values correctly but pmval prints ! in place of the negative values.

$ pminfo -f mmv.acme.products.count

mmv.acme.products.count
    inst [0 or "Anvils"] value -1849.6024
    inst [1 or "Rockets"] value -3.6371837e+31
    inst [2 or "Giant_Rubber_Bands"] value -6.3034399e+09

$ pmval mmv.acme.products.count

metric:    mmv.acme.products.count
host:      beaglebone-01
semantics: instantaneous value
units:     byte
samples:   all
full label for instance[0]: Anvils
full label for instance[1]: Rockets
full label for instance[2]: Giant_Rubber_Bands

       Anvils       Rockets Giant_Rubber_
            !     1.194E-05     3.127E-35
            !     2.816E-30     1.712E-17
    4.185E-28        0.8811     1.438E-32

This might be the location in pmval where this might need to be fixed pmval.c#L505

You can see here the changes made to acme.c to print negative numbers.

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