Correction to Médéric previous patch

glob is imported in the pcigale/session/configuration.py to allow its use in
the configuration file (with eval).

TODO: write a new configuration pattern to add several files with something
like "files *.fits".

pcigale/session/configuration.py

@@ -9,6 +9,7 @@ import pkgutil
 import collections
 import itertools
 import numpy as np
+from glob import glob # To allow the use of glob() in "eval..."
 from textwrap import wrap
 from .tools import param_dict_combine
 from ..data import Database