WIP : copy protein dbxref list

src/core/proteinxtp.cpp

@@ -75,6 +75,7 @@ ProteinXtp::ProteinXtp(const ProteinXtp& other):pappso::Protein(other)
     _is_contaminant=other._is_contaminant;
     _p_sequence_database = other._p_sequence_database;
     _p_fasta = other._p_fasta;
+    _dbxref_list = other._dbxref_list;
 }
 
 ProteinXtp::~ProteinXtp()