Convert all upscaling programs to new pinch behaviour.

This means that PINCH must be used in the input deck,
whereas before, z_tolerance was available as a program
parameter (but only for some programs). A benefit is that
all programs will now uniformly accept PINCH in the input
decks.
Merge pull request #125 from atgeirr/use-pinch

Convert all upscaling programs to new pinch behaviour.