Input/Output or Output parameters have to be retrieved by .fetch methods,
the .sp_outparams attribute indicates if the result set contains output
parameters.
While the default paramstyle is still 'qmark', MariaDB Connector/Python
now also supports the paramstyles 'format' and 'pyformat'. The paramstyles
can't be mixed.
* adding file encoding
* test file renamed with test_ prefix permitting unittest discovery
* test configuration using dict using environment data for futur CI testing
* test correction (using table t1) permitting unittest parallel testing
now tests can be run using `python -m unittest -v`
or for python 2 `python -m unittest discover -v`
