save and retrieve chrsm_ information to Tree for Small Deletions

src/libaevol/mutation/SmallDeletion.cpp

@@ -55,11 +55,17 @@ SmallDeletion::SmallDeletion(int32_t pos, int16_t length) :
 void SmallDeletion::save(gzFile backup_file) const {
   int8_t tmp_mut_type = S_DEL;
   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_));
 }
 
 void SmallDeletion::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_));
 }