Fix padding of entries in .prof files

When the number of entries of a cost centre reaches 11 digits, it takes
up the whole space reserved for it and the prof file ends up looking
like:

    ... no.        entries  %time %alloc   %time %alloc

        ...
    ... 120918     978250    0.0    0.0     0.0    0.0
    ... 118891          0    0.0    0.0    73.3   80.8
    ... 11890229702412351    8.9   13.5    73.3   80.8
    ... 118903  153799689    0.0    0.1     0.0    0.1
        ...

This results in tooling not being able to parse the .prof file.  I
realise we have the JSON output as well now, but still it'd be good to
fix this little weirdness.

Original bug report and full prof file can be seen here:
<https://github.com/jaspervdj/profiteur/issues/28>.

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