jsoniq 0.2.0 alpha 1

• Allow to bind JSONiq variables to pandas dataframes
• Allow to retrieve the output of a JSONiq query as a pandas dataframe (if the output is available as a dataframe, i.e., availableOutputs() returns a list that contains "DataFrame")
• Clean up the mapping to strictly map tuples to sequence of items, and lists ot array items. This will avoid confusion between arrays and sequences.
• As a consequence, json() now returns a tuple, not a list.
• Calling bind() with a single list will return an informative error. Use bind() with a tuple instead, or call bindOne() to interpret the list as a sequence of one array item.