ERT-341: Added test raises for ErtTestcontext with missing config file.
ERT-341: Removed debug output from matrix_fprintf()
ERT-341: Added function to get obs key from obs_vector.
ERT-341: Added enkf_obs_iget_vector() and enkf_obs_get_size()
ERT-341: Added various __xxx__() methods to the enkf_obs python implementation.
ERT-341: pca_fetcher will check that it has data.
ERT-341: Added python testing for obsVector.hasData()
ERT-341: Added enkf_node_deep_alloc() to ensure that container subelements are also allocated.