The problem was that when one shell was specified without an explicit
group the created automatic group was lacking the default values for
parameters 'normalize' and 'normion'. The current design, however,
assumes that they must always be set.
A single-file test suite for 'inpconf.py' is split into several files,
each containing a separate TestCase class. In addition, all test cases
are derived from class ArrayTestCase (in turn derived from TestCase)
which contains a numpy-array equality method.
