Minor changes in code to improve readability and fix C compilation

warnings

python/obitools3/obidms/_obidms.pxd

@@ -32,7 +32,7 @@ cdef class OBIDMS_column:
 
     cdef OBIDMS_column_p    pointer
     cdef OBIDMS             dms
-    cdef str                data_type   # TODO keep as OBIType_t? both?
+    cdef str                data_type
     cdef str                dms_name
     cdef str                column_name
     cdef index_t            nb_elements_per_line

python/obitools3/obidms/_obidms.pyx

@@ -61,7 +61,8 @@ cdef class OBIDMS :
         # Fill structure and create or open the DMS
         self.dms_name = dms_name
         self.pointer = obi_dms(<const_char_p> dms_name_b)
-        # TODO: test pointer and raise Exception("Failed opening or creating an OBIDMS")
+        if self.pointer == NULL :
+            raise Exception("Failed opening or creating an OBIDMS")
 
 
     cpdef close(self) :

python/obitools3/obidms/capi/obitypes.pxd

@@ -16,13 +16,8 @@ cdef extern from "obidmscolumn.h" nogil:
 
 cdef extern from "obitypes.h" nogil:
 
-    enum OBIType:       # TODO je sais pas si ça sert de declarer le contenu de l'enum
-        OBI_VOID = 0,
-        OBI_INT,
-        OBI_FLOAT,
-        OBI_BOOL,
-        OBI_CHAR,
-        OBI_IDX
+    enum OBIType:
+        pass
     
     ctypedef OBIType OBIType_t