save and retrieve chrsm_ information to Tree for Small Insertions

src/libaevol/mutation/SmallInsertion.cpp

@@ -76,12 +76,18 @@ SmallInsertion::~SmallInsertion() noexcept {
 void SmallInsertion::save(gzFile backup_file) const {
   int8_t tmp_mut_type = S_INS;
   gzwrite(backup_file, &tmp_mut_type, sizeof(tmp_mut_type));
+  #ifdef __EUKARYOTE
+  gzwrite(backup_file, &chrsm_, sizeof(chrsm_));
+  #endif
   gzwrite(backup_file, &pos_, sizeof(pos_));
   gzwrite(backup_file, &length_, sizeof(length_));
   gzwrite(backup_file, seq_, length_ * sizeof(seq_[0]));
 }
 
 void SmallInsertion::load(gzFile backup_file) {
+  #ifdef __EUKARYOTE
+  gzread(backup_file, &chrsm_, sizeof(chrsm_));
+  #endif
   gzread(backup_file, &pos_, sizeof(pos_));
   gzread(backup_file, &length_, sizeof(length_));
   seq_ = new char[length_ + 1];