add non-relative patch
add non-relative patch

Under certain conditions we want to be able to disable the relative
patching performed.  This sets the default behavior to the relative
patch but allows that to be disabled and the name patched as is without
any added prefix.

* fixes #54

alunduil/torment,devx/torment,swarren83/torment,doublerr/torment,kumoru/torment