`log_sbml_errors` ignores error severity

[FFroehlich]

libpetab-python/petab/sbml.py

Line 65 in 286494a

severity = error.getSeverityAsString()

returns a string, but libsbml.LIBSBML_SEV_INFO and libsbml.LIBSBML_SEV_WARNING are integers (0 and 1). Thus,

libpetab-python/petab/sbml.py

Line 67 in 286494a

if severity == libsbml.LIBSBML_SEV_INFO:

and

libpetab-python/petab/sbml.py

Line 69 in 286494a

elif severity == libsbml.LIBSBML_SEV_WARNING:

never match and everything is logged as error.