Review Redshift Candidates description, warning flags and errors

Warning flags evolution:
Each solver has warning flags, not only redshift solvers, so we add flags for galaxy and qso line measurement solvers and for classification solver.
Error handling has evolved in drp1d_pipe 0.38, the pipeline does not stop if a solver fails, so we add an error code for each solver. The result is the modification of first header of redshift candidates product :

GALAXY_LWARNING INT64 Quality flags for galaxy line measurement solver
QSO_LWARNING INT64 Quality flags for QSO line measurement solver
CLASSIFICATION_WARNING INT64 Quality flags for classification solver
GALAXY_ZERROR INT64 Error code for galaxy solver
QSO_ZERROR INT64 Error code for QSO solver
STAR_ZERROR INT64 Error code for star solver
GALAXY_LERROR INT64 Error code for galaxy line measurement solver
QSO_LERROR INT64 Error code for QSO line measurement solver
CLASSIFICATION_ERROR INT64 Error code for classification solver

https://github.com/Subaru-PFS/datamodel/blob/e76f0b5a2d483b09142f42fbbb407a114b842246/datamodel.txt#L890