Calculate impact of proposed DMS-REQ-0329

DMS-REQ-0329 proposes that DM generate tiles suitable for all sky visualization tools.

For LCR-962 we must calculate the impact in terms of sizing model and software effort required to generate these tiles. Our baseline proposal is to assume that these tiles can be generated from the deep coadds.

We therefore have to estimate the compute required to generate the sky tiles from the deep coadds, and whether there will be existing capacity for this to be done after the main data release has been created but before the release is made public.

We will include a risk that this approach will not result in tiles of sufficient quality and the tiles will have to be regenerated from PVIs. The cost impact of that is known if we assume that generating the deep coadds is independent of sky projection (ie we have to generate the deep coadds twice).