minor update sessions (time only)

examples/WP_revisited/blocking_semantics5/why3session.xml

examples/avl/priority_queue/why3session.xml

examples/bitcount/why3session.xml

examples/bitvectors/bitvector/why3session.xml

examples/bitvectors/power2/why3session.xml

examples/dijkstra/why3session.xml

examples/edit_distance/why3session.xml

examples/gcd_bezout/why3session.xml

examples/isqrt_von_neumann/why3session.xml

examples/koda_ruskey/why3session.xml

examples/linear_probing/why3session.xml

examples/linked_list_rev/why3session.xml

examples/logic/ffx/why3session.xml

examples/logic/triangle_inequality/why3session.xml

examples/mergesort_list/why3session.xml

examples/multiprecision/add/why3session.xml

examples/multiprecision/div/why3session.xml

examples/multiprecision/lineardecision/why3session.xml

examples/multiprecision/logical/why3session.xml

examples/multiprecision/mul/why3session.xml