* lib.c (upop): New function.

* lib.h (upop): Declared.

* txr.c (txr_main): Two bugfixes. One is that the argument -
was being pushed back twice resulting in *args* being ("-" "-").
This is because the option processing loop checked for "-" and pushed
it back into args, and then some logic after the loop pushed arg back
into args again. But, these pushes were wrong because they push
back a different cons cell; we would like to be able to
do (ldiff *full-args* *args*). This is solved by upop, which provides
one element of undo. After upop, we can restore the prior list
from the undo save location.

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