ERT-542: Added check with raise KeyError before calling c function iget_name_kw().
ERT-542: Added __len__() method to ecl_sum - returning the number of timesteps.
ERT-542: Added count() method on IntVector.
ERT-542: Protecting the initialization process against missing report steps.
Merge pull request #403 from joakim-hove/ERT-542-python-bugs

Ert 542 python bugs