Fix to bug report: #26

The function "allocFutureJob" was forgetting one freespace case which happened when the freespace was entirely included in the span provided by the horizon job.

assigned to @bleuse

Thanks for the merge request. There are a few quirks, notably with the file indentation, but I'll fix those.

@pdutot would you mind having a look at branch fix/26_bogus-easy-bf that fixes the identation, and check if the patch sent by @gaupy works?

requested review from @pdutot