MUMBAI, Jan. 22 -- Political manoeuvring for control of the Mumbai Metropolitan Region (MMR) has led MNS chief Raj Thackeray and deputy chief minister and Shiv Sena chief, Eknath Shinde, to make some big moves that threaten to strain two key alliances forged for the recent municipal elections. On Wednesday, the Raj Thackeray-led Maharashtra Navnirman Sena (MNS) extended support to the Sena in the Kalyan-Dombivli Municipal Corporation (KDMC), adding crucial numbers to Shinde's quest for a majority in the corporation. Shinde's bid for power in Kalyan - he has also virtually outmanoeuvred the BJP in neighbouring Ulhasnagar - is likely to sharpen tensions between the Sena and BJP, which contested the civic polls together but have been locked in...