[reportlab-users] Invariant support for documents

[Andy Robinson]

> This will allow us to test if, for example, a COM wrapper
> around our library outputs the same test file as the normal
> script.  I do not yet promise invariance across operating
> systems but that would obviously be nice so we could
> do post-intall checks on installed systems easily.

At least test_hello.pdf is the same across FreeBSD and
Windows.  However some things we do use addresses of objects
in memory as unique identifiers (e.g. Form XObjects)
which needs to be sorted out.

- Andy