Remove TABs from examples

Remove trailing whitespace in examples directory.

Correct right-shift operation in Crypt/TEA.

Now use Logical shift right (in HOL >>>). Before, arithmetic shift
right (in HOL >>) was used. It looked like the C I was working from,
but had different semantics. Once again a reason to hate and distrust
overloading (in C this time, but its good to hate overloading
universally).

Thanks to David Hardin for noticing this bug.

Comment out generation/emission of ML code for SHA-1 and TEA. The
emitted files were bogus, and caused compilation to fail in
src/emit/ML. This latter directory isn't normally compiled at all,
but the ordinal example is set up to depend on it, so it ends up being
compiled when Holmake calls itself recursively.

Get TEA to half-build, again failing to get ML emission correct.
Rather than attempt to have ML code emitted into this directory, where
it will then confuse Holmake, I follow the SHA1 example, and push it
off to src/emit/ML (except that it again complains about words$n2w).
This removes the need for the Holmakefile.

Slight mods.

Make use of WORDS_EMIT_RULE.

Mods to tea. Some more yet to come, as soon as I figure out
how to interface with wordsML.