[m-rev.] for review: define <<u and >>u

[Zoltan Somogyi]

This diff is boring, since it makes each change ten times
(one set of changes to library/{int,uint}*.m, and another set
to tests/hard_coded/bitwise_{int,uint}*.m), but once you have
checked one copy, you can just check whether it was copied
correctly to the other nine files.

Since this diff requires the installed compiler to recognize <<u and >>u
as operators, I won't commit this until an rotd contains the both
the change that enables that, and the new synonym for
compiler-sufficiently-recent that I just added to options.m in order to allow
configure to test for that. This won't be before wednesday. I will
post the proposed update to NEWS before then.

Zoltan.
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