Rename config module to setup. Split ssp_setup.py into separate modules.

`ssp_setup.py` split to:
- `logging.py`: logging setup
- `exit.py`: exit function
- `outdir.py`: functions to handle output directory

Author: claudiodsf

sourcespec2/config/__init__.py renamed to sourcespec2/setup/__init__.py

@@ -11,4 +11,8 @@
 """
 from .config import config  # noqa
 from .configure_cli import configure_cli  # noqa
-from .library_versions import library_versions  # noqa
+from .logging import setup_logging  # noqa
+from .exit import ssp_exit  # noqa
+from .outdir import (  # noqa
+    get_outdir_path, save_config, move_outdir, remove_old_outdir
+)

sourcespec2/config/config.py renamed to sourcespec2/setup/config.py

@@ -26,6 +26,18 @@
 from .configobj.validate import Validator
 from ..ssp_update_db import update_db_file
 
+# define ipshell(), if possible
+# note: ANSI colors do not work on Windows standard terminal
+if sys.stdout.isatty() and sys.platform != 'win32':
+    try:
+        from IPython.terminal.embed import InteractiveShellEmbed
+        from traitlets.config import MultipleInstanceError
+        IPSHELL = InteractiveShellEmbed.instance()
+    except (ImportError, MultipleInstanceError):
+        IPSHELL = None
+else:
+    IPSHELL = None
+
 
 def _write_sample_config(configspec, progname):
     """

sourcespec2/config/configobj/LICENSE renamed to sourcespec2/setup/configobj/LICENSE

@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: CECILL-2.1
+"""
+An exit function for SourceSpec.
+
+:copyright:
+    2012 Claudio Satriano <satriano@ipgp.fr>
+
+    2013-2014 Claudio Satriano <satriano@ipgp.fr>,
+              Emanuela Matrullo <matrullo@geologie.ens.fr>,
+              Agnes Chounet <chounet@ipgp.fr>
+
+    2015-2024 Claudio Satriano <satriano@ipgp.fr>
+:license:
+    CeCILL Free Software License Agreement v2.1
+    (http://www.cecill.info/licences.en.html)
+"""
+import sys
+import logging
+import signal
+logger = logging.getLogger(__name__.rsplit('.', maxsplit=1)[-1])
+
+
+def ssp_exit(retval=0, abort=False):
+    """Exit the program."""
+    # ssp_exit might have already been called if multiprocessing
+    if ssp_exit.SSP_EXIT_CALLED:
+        return
+    ssp_exit.SSP_EXIT_CALLED = True
+    if abort:
+        print('\nAborting.')
+        if logger is not None:
+            logger.debug('source_spec ABORTED')
+    elif logger is not None:
+        logger.debug('source_spec END')
+    logging.shutdown()
+    sys.exit(retval)
+
+
+ssp_exit.SSP_EXIT_CALLED = False
+
+
+def _sigint_handler(sig, frame):
+    """Handle SIGINT signal."""
+    # pylint: disable=unused-argument
+    ssp_exit(1, abort=True)
+
+
+signal.signal(signal.SIGINT, _sigint_handler)