pyhande.testcode: always rename eigenvalue columns.
pyhande.testcode: always rename eigenvalue columns.

It's useful to insert eigv before the eigenvalue index always (even if
not using underscores instead of spaces) to aid the reader.

hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,ruthfranklin/hande,hande-qmc/hande,hande-qmc/hande