Parameter values for k and c must be numbers, not strings.

run.sh passes the `k` parameter to `run_spectral.py`, which meant it was coming through as a string rather than a number, causing

    File "/Users/ian/work/trendminer-python/clustering/knnmatrix.py", line 6, in knnmatrix
      indi=zeros(k*n,dtype=int); 
    ValueError: sequence too large; must be smaller than 32