[ic] NoExportExternal exception for manual exports

[Jon Jensen]

Interchangers,

Do any of you use the NoExportExternal directive?

I do for a few catalogs and while it's great to have less junk output and 
wasted CPU and I/O for writing table exports that aren't needed, I've 
found that one annoyance is that it blocks even intentional manual table 
exports such as are typically done through the admin.

The attached patch makes an exception for such cases. If nobody objects, 
I'll commit it.

Thanks,
Jon

--
Jon Jensen
End Point Corporation
http://www.endpoint.com/
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