Picat: added 10_one_liners.pi floyd_warshall.pi least_common_multiple.pi merge_sort.pi min_adjacent_coins.pi set_packing.pi shell_sort.pi sum_multiples_of_3_and_5.pi tobacco.pi transportation.pi trial1.pi twice_the_number.pi. Added some variants in euler1.pi find_the_missing_permutation.pi