added Deg2QsrsElement.hecke_operator
Removed KlingenEisensteinAndCuspForms.hecke_tp_matrix. Added hecke_matrix.
Refactoring.
Removed KlingenEisensteinAndCuspForms.hecke_tp_matrix. Added hecke_matrix.
Added KlingenEisensteinAndCuspForms.hecke_charpoly.
Minor bug fix.
Added method klingeneisensteinAndCuspForms and basis to CuspFormsDegree2.
Minor fix.