Cython API: cleaner column rewriting API

python/obitools3/commands/import.pyx

@@ -237,7 +237,8 @@ def run(config):
                             dcols[tag] = (view.rewrite_column_with_diff_attributes(old_column.name, 
                                                                                    new_data_type=new_type, 
                                                                                    new_nb_elements_per_line=new_nb_elements_per_line,
-                                                                                   new_elements_names=new_elements_names), 
+                                                                                   new_elements_names=new_elements_names,
+                                                                                   rewrite_last_line=False), 
                                           value_obitype)
                              
                             # Update the dictionary:

python/obitools3/dms/view/view.pxd

@@ -32,7 +32,8 @@ cdef class View(OBIWrapper):
                                                      object    column_name,
                                                      obitype_t new_data_type=*,
                                                      index_t   new_nb_elements_per_line=*,
-                                                     list      new_elements_names=*)
+                                                     list      new_elements_names=*,
+                                                     bint      rewrite_last_line=*)
 
     cpdef Line_selection new_selection(self,
                                        list lines=*)

python/obitools3/dms/view/view.pyx

@@ -267,13 +267,17 @@ cdef class View(OBIWrapper) :
                                                      object    column_name,
                                                      obitype_t new_data_type=<obitype_t>OBI_VOID,
                                                      index_t   new_nb_elements_per_line=0,
-                                                     list      new_elements_names=None) :
+                                                     list      new_elements_names=None,
+                                                     bint      rewrite_last_line=False) :
         
         cdef Column  old_column                                             
         cdef Column  new_column
-        cdef index_t length = len(self) - 1
+        cdef index_t length = len(self)    # TODO because last line triggered error that triggered rewriting, but needs a cleaner way, or at least good documentation
         cdef column_name_b = tobytes(column_name)
 
+        if rewrite_last_line is False:
+            length-=1
+            
         if not self.active() :
             raise OBIDeactivatedInstanceError()