Work to include Lanczos solver. ARPACK diagonaliazation of the H done, checked ground state
energies and vectors with LAPACK ok.
LANCZOS code written. Still under testing.
Groundstate properties with ARPACK Lanczos perfectly crosscheks with Full diagonalization.
GF evaluation, using plain lanczos, has some problems and needs debug.
1st working version. Test gives good reasonable results. more debug to do but this is a starting point.
nitermax+1 bug fixed in plain_lanczos.f90 and plain_lanczos_tridiag call for the green's functions.
more tests to do and debug. slowly converging.
LANCZOS CODE at T=0 working and tested. Lanczos extension integrated into the
original code. Some module was re-named to extend the code. A simple Hubbard model
driver is lanced_hm_bethe.f90. It gives good cross-check with finite T code.
More tests are required and to come.
added lanczos lda1b code.
further tests are successfull against fulled codes.