Stop test from creating random file in ./
Stop test from creating random file in ./

One of the tests for normalise-by-median in test_scripts.py created an
extra file in the current directory. This patch ensures that we manually
specify an output file.

	modified:   tests/test_scripts.py

kdmurray91/khmer,F1000Research/khmer,souravsingh/khmer,kdmurray91/khmer,jas14/khmer,kdmurray91/khmer,F1000Research/khmer,Winterflower/khmer,F1000Research/khmer,ged-lab/khmer,souravsingh/khmer,jas14/khmer,ged-lab/khmer,Winterflower/khmer,Winterflower/khmer,ged-lab/khmer,souravsingh/khmer,jas14/khmer