Add several "check" methods for running TestInput objects directly

[d-torrance]

We add check(TestInput), check(ZZ) (for checking a test from the last call to tests), and check(List) (for running several tests). For example:

i1 : tests "Python"

o1 = {0 => TestInput[../packages/Python.m2:425:5-456:3] }
     {1 => TestInput[../packages/Python.m2:458:5-481:3] }
     {2 => TestInput[../packages/Python.m2:483:5-564:3] }
     {3 => TestInput[../packages/Python.m2:566:5-593:3] }
     {4 => TestInput[../packages/Python.m2:595:5-601:3] }
     {5 => TestInput[../packages/Python.m2:603:5-623:3] }
     {6 => TestInput[../packages/Python.m2:626:5-668:3] }
     {7 => TestInput[../packages/Python.m2:670:5-676:3] }
     {8 => TestInput[../packages/Python.m2:678:5-708:3] }
     {9 => TestInput[../packages/Python.m2:710:5-718:3] }
     {10 => TestInput[../packages/Python.m2:720:5-726:3]}

o1 : NumberedVerticalList

i2 : check oo#5
 -- capturing check(5, "Python")                 -- .0560508s elapsed

i3 : check 7
 -- capturing check(7, "Python")                 -- .0535221s elapsed

i4 : check {o1#2, o1#6, o1#9}
 -- capturing check(2, "Python")                 -- .058056s elapsed
 -- capturing check(6, "Python")                 -- .0539775s elapsed
 -- capturing check(9, "Python")                 -- .0563448s elapsed

Cc: @pzinn