Fix bugs in recursive partial correlations

* gn3/computations/partial_correlations.py: Remove rounding. Fix computation
  of remaining covariates
*
tests/unit/computations/partial_correlations_test_data/pcor_rec_blackbox_test.txt:
  reduce the number of covariates to between one (1) and three (3)
* tests/unit/computations/test_partial_correlations.py: fix some minor bugs

  It turns out that the computation complexity increases exponentially, with
  the number of covariates. Therefore, to get a somewhat sensible test time,
  while retaining a large-ish number of tests, this commit reduces the number
  of covariates to between 1 and 3.

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