DUBAI (Reuters) - Bahrain's opposition said on Wednesday the first session of a national dialogue for reforms in the Gulf island kingdom raised questions over whether talks aimed at easing tensions after unrest this year can succeed. The country's Sunni rulers crushed mostly Shi'ite-led pro-democracy protests in March. After a four-month crackdown, Bahrain hopes to lay the groundwork to heal deep rifts. But opposition groups said the first working session of the dialogue on Tuesday night left them concerned that their main demand -- a representative, directly elected government -- would never reach a consensus in break-out groups where some 60 people were allowed only five minutes to present...