[m-rev.] for review: bulk unify and compare

[Zoltan Somogyi]

I just committed the diff with the changes that the reviews asked for.
It has clean bootchecks in hlc.gc and asm_fast.gc, but there were
*lots* of differences from tools/make_java_csharp_diff; too many
to visually check them all. The ones I did check were all trivial changes
in variable names, a consequence of the fact that unify_proc.m now
allocates variables in a different order than it used to, which changes
HLDS variable numbers (which get included in Java and C# variable names).

Julien, can I ask you to try out the updated compiler in the Java and C#
grades?

Zoltan.