Make glob() available in configuration

Making glob() available in session/configuration.py allows users of
savefluxes and sfhfromfile to use something like

filename = "eval glob('sfh*.fits')"
sfr_column = 2

to take the star formation history from several files.

pcigale/session/configuration.py

@@ -10,6 +10,7 @@ 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