Fix test-biplot.R with lapack 3.10 With lapack 3.10, test-biplot.R fails, because some results have the opposite sign compared to the one which is expected. . This comes from the SVD of barleyMatrix in that test file, which is different between lapack 3.9 and 3.10. Mathematically, the SVD is not unique, and lapack 3.10 returns a different (still valid) solution. . This patch accomodates sign differences in the columns of the test matrices, so that the test passes with both lapack 3.9 and lapack 3.10.
