ISLAMABAD (Reuters) -Candidates backed by the party of jailed Pakistani opposition leader Imran Khan plan to form a government, a senior aide to the former prime minister said on Saturday, urging supporters to peacefully protest if final election results are not released. Both Khan and his main rival, three-time former Prime Minister Nawaz Sharif, declared victory on Friday, increasing uncertainty over who will form the next government at a time when swift policy action is needed to address mult