NEW DELHI, Jan. 20 -- The battle-lines for the 2019 Lok Sabha elections became clearer on Saturday with 18 opposition parties coming together for a rally in Kolkata with one unifying goal: defeating the Narendra Modi-led Bharatiya Janata Party (BJP) at the Centre in 2019 Lok Sabha elections. But, this may not translate into a national pre-poll alliance, even though some statelevel opposition coalitions are taking shape....