Old Proposal Copying
Requirement from ttaToolsSysDescription.pdf (2.2.4): "It shall be possible, with best efforts, to create a new draft from a proposal in the WITHDRAWN or COMPLETEDÂ state."
There is an expensive interaction between wanting to support copying proposals (as templates for new proposals) and supporting ever-changing telescope resources/backends. Supporting the edit view of historical resources implies having the code from every release of the PST. Some backends are simply deprecated. Decisions need to be made about how copying should work with backends that change or disappear entirely.
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