[m-rev.] for review: pack args next to remote sectags

[Zoltan Somogyi]

For review by Peter or Julien. The diff is with -b due to systematic
changes in indentation levels in some files.

The part of this diff that required the most work was the changes
to the RTTI system. I tried to add test cases for each part of the system
that was affected by this, from library/construct.m, library/deconstructs.m,
deep copying and tabling, but there is one affected module for which
I don't feel comfortable writing tests: library/store.m. If someone
could add a test case checking the proper operation of store.m
on terms that use the new data representation, I would appreciate it.

Zoltan.
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