[sv-bc] Package export proposal

I've uploaded an initial cut at the export proposal and
attached it to Mantis 1323 as a placeholder.
    http://www.verilog.org/svdb/bug_view_page.php?bug_id=0001323
See the attached package_exports.htm.

I think that I've managed to incorporate all the changes
suggested from within the sub-group.  If anyone sees errors
or omissions, please let me know.

I have not yet included the "local" declaration change since
I need to hear some feedback as to whether there need to
be semantic restrictions on the general case.

Gord.
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Gordon Vreugdenhil                                503-685-0808
Model Technology (Mentor Graphics)                gordonv@model.com