Compressed sensing is numerically unstable
The compressed sensing matches for testsuite/real_time/12-absorption.05-spectrum_compressed_sensing.inp, 13-absorption-spin.05-spectrum_compressed_sensing.inp, 14-absorption-spinors.05-spectrum_compressed_sensing.inp have a large amount of variation between machines and also between individual runs with a given octopus executable. Apparently this has been the case since the beginning. This part of the code should be made more deterministic.