HTCondor Collector stores scroes as integer

[mschnepf]

The HTCondor collector uses the maybe_convert function to convert the score value from the condor query. However, maybe_convert tries to convert a string first in integer and when it fails, it tries to convert in float. Therefore, the collector stores numbers as integers. For that part, a simple convert to float should be fine.

[dirksammel]

Solved by #990