opendata

This commit reorganized library's folder structure to remove duplicated files and functions's definitions, as it was happening with "queries_definitions.py" file. Also, it were removed 'xml' and 'json' subfolders, and their contents were moved to lib file with "xml_" and "json_" prefixes.

Signed-off-by: Bruno Nocera Zanette <brunonzanette@gmail.com>