Fix for CONPY-9 and CONPY-17:

description attribute is now implemented as getter function().
Changes:
- for strings length will now report the number of codepoints (instead) of bytes
- variable length datatypes will report -1 (packed len < 1).
- For floating point values (decimal, float, double) the values for precision and scale will be zero, in case the server sends decimals=31 (which means no precision/scale) was specified for the column.

include/mariadb_python.h

@@ -134,7 +134,6 @@ typedef struct {
   MYSQL_FIELD *fields;
   char *statement;
   unsigned long statement_len;
-  PyObject *description;
   PyObject **values;
   PyStructSequence_Desc sequence_desc;
   PyStructSequence_Field *sequence_fields;