Lawyers protesting canals project end Khairpur sit-in / Lawyers, opposition parties in Sindh reject PM's announcement on canals / PPP, PML-N trade fresh barbs as canals dispute deepens / PM to decide on canals project, Sindh open to discussion: Sanaullah / Coalition partners put canals on the negotiating table / Federal and Sindh govts agree to resolve canals project issue through talks / Canals case: SHC tells Sindh, Centre to safeguard national unity / PPP shedding 'crocodile tears' on canals: Qureshi / Punjab and Sindh ministers engage in verbal spat over canals project / Experts in Sindh reject new canals, suggest alternatives to irrigate Cholistan