Columns: elements names informations are now kept in a memory arena of

adapted size in the header, and added a boolean in the header indicating
whether the values should be evaluated (typically character strings to
be evaluated in Python)

python/obitools3/dms/capi/obidmscolumn.pxd

@@ -32,6 +32,7 @@ cdef extern from "obidmscolumn.h" nogil:
         OBIType_t           returned_data_type
         OBIType_t           stored_data_type
         bint                tuples
+        bint                to_eval
         time_t              creation_date
         obiversion_t        version
         obiversion_t        cloned_from

python/obitools3/dms/capi/obiview.pxd

@@ -86,7 +86,9 @@ cdef extern from "obiview.h" nogil:
                             index_t nb_lines,
                             index_t nb_elements_per_line,
                             char* elements_names,
+                            bint  elt_names_formatted,
                             bint tuples,
+                            bint to_eval,
                             const_char_p indexer_name,
                             const_char_p associated_column_name,
                             obiversion_t associated_column_version,

python/obitools3/dms/column/typed_column/str.pyx

@@ -56,6 +56,9 @@ cdef class Column_str(Column_idx):
         obi_errno_to_exception(obi_errno, line_nb=line_nb, elt_id=None, error_message="Problem getting a value from a column")
         if value == OBIStr_NA :
             result = None
+        # For columns containing character strings that should be evaluated:
+        elif self.to_eval:
+            result = eval(value)
         else :
             result = <bytes> value      # NOTE: value is not freed because the pointer points to a mmapped region in an AVL data file.
         return result

python/obitools3/dms/view/view.pyx

@@ -330,6 +330,7 @@ cdef class View(OBIWrapper) :
         line = self[idx]
         for k in item :
             # If setting from another View Line and the column doesn't exist, create it based on the informations from the other View
+            # TODO use clone_column
             if isinstance(item, Line) and tostr(k) not in self:
                 col = item.view[k]
                 Column.new_column(self, 
@@ -337,6 +338,8 @@ cdef class View(OBIWrapper) :
                                   col.data_type_int, 
                                   nb_elements_per_line = col.nb_elements_per_line,
                                   elements_names = col.elements_names,
+                                  tuples = col.tuples,
+                                  to_eval = col.to_eval,
                                   comments = col.comments,
                                   alias=k
                                  )