Adopt ML-style syntax for case expressions and use freed up "||" for bitwise-or. See issue #24.

Removed trailing whitespace from all .sml and .sig files.

This affects over 900 files and was done using emacs's delete-trailing-whitespace
function in batch mode. Building the system with Poly/ML and Moscow ML seems to
work, so I'm hoping these changes don't break anything. Please complain if
they do!

A new version of files previously in examples/mc-logic.
Eventually examples/mc-logic will be deleted.