By Jan Strupczewski BRUSSELS (Reuters) - Spain and Slovenia have banking and labor-market problems that are causing imbalances in their economies, the European Commission warned on Wednesday after an in-depth review of 13 European Union countries designed to stop trouble in individual states becoming a wider problem. The early warning system, called the macroeconomic imbalances procedure, was set up after problems in Greece, Ireland and Portugal triggered the euro zone sovereign debt crisis, forcing euro zone countries to bail them out. It can result in a fine of 0. ...