Alignment fix

I have just applied a patch to centralize the attribute alignment and
size computations in two new macros, att_align() and att_addlength().

This removes many switch statements that performed this task.

It probably does not change any functionality, but I was uncertain that
all the alignment was being handled in the same way, and with this patch
I guarantee it.

Please test the index problem to see if anything has changed.  My
regression tests show no changes from the patch, but I don't see the
index problem here.

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