concurrency added

Concurrency option was added using a threadpool. The cliclient was refactored due to the big size of the process_request function.

In the dcquery module, two minor changes were added. The first was a fix to the set_qos method. The second was a improvement to the get_all_absolute_paths method.

Finally the --threads -j option was added to the parser for the concurrency, a progress bar was added for the quiet mode and the progress bar dependency was added to setup.py