[MERGE] Deprecate export-related InventoryEntry methods

[Ian Clatworthy]

This patch refactors the export code to include the actual
exporting logic, rather than delegating this responsibility
to InventoryEntry objects. This refactoring is needed for
the content filtering feature where being able to optionally
enable content filtering during an export is desirable.

As discussed on the list and IRC previously, the relevant
InventoryEntry methods have been deprecated. There are
currently no API tests for these and I personally don't
believe adding them for the sake of testing the deprecation
is necessary. (But I'll do it if the reviewer absolutely
insists on it.)

Ian C.
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