Initialize QA dir upon object creation

If the ENIGMA_MEG_QA is not created - mkdir it.
(enigma_meg_test) jstout@kani:/fast/ENIGMA_OHBM$ ~/src/enigma_MEG/enigmeg/QA/Run_enigma_QA_GUI.py -bids_root $(pwd) -QAtype 'bem'
Traceback (most recent call last):
  File "/home/jstout/src/enigma_MEG/enigmeg/QA/Run_enigma_QA_GUI.py", line 82, in <module>
    history_log = initialize(bids_root, QAtype)        
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jstout/src/enigma_MEG/enigmeg/QA/enigma_QA_GUI_functions.py", line 170, in initialize
    logging.basicConfig(filename=logfile, encoding='utf-8', level=logging.INFO, 
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jstout/miniconda3/envs/enigma_meg_test/lib/python3.11/logging/__init__.py", line 2050, in basicConfig
    h = FileHandler(filename, mode,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jstout/miniconda3/envs/enigma_meg_test/lib/python3.11/logging/__init__.py", line 1181, in __init__
    StreamHandler.__init__(self, self._open())
                                 ^^^^^^^^^^^^
  File "/home/jstout/miniconda3/envs/enigma_meg_test/lib/python3.11/logging/__init__.py", line 1213, in _open
    return open_func(self.baseFilename, self.mode,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/fast/ENIGMA_OHBM/derivatives/ENIGMA_MEG_QA/bem_QA_logfile.txt'
jstout211 / enigma_MEG

Initialize QA dir upon object creation #36
