fix: update sizing to use fibonacci sequence.

[aminomancer]

Fixes #284

[aminomancer]

• Ron said we could add back XL but give it 20+ for potential future use. Didn't check if Bugzilla has points that go that high, I'll probably just give it the max number Bugzilla supports
• We have "Remaining work per person" on iteration views, but it's empty for finished iterations, so it's hard to retrospectively get information on capacity for a given iteration. Would be good to add "Total work per person" showing finished bugs (including the total for the whole team) in addition to the one showing unfinished bugs
• On the Engineering Allocation view, we could consider adding a section at the bottom showing the same stuff. But instead of remaining/total work per person, per iteration, it would probably be per release, as the Engineering Allocation view is per release.

[AllegroFox]

This is straightforward! Thanks :)

[aminomancer]

Thanks for reviewing!

[AllegroFox]

To your point about the XL: looks like the max number of points in Bugzilla is 15; which we could just use for XL regardless despite it not being in sequence (that would leave us 8 & 13 for L). Seems reasonable as a workaround for 20+ not being in bugzilla, since we would end up with 2 point amounts for each "level" (1 & 2 for SM, 3 & 5 for MD, 8 & 13 for L) and then just max value for XL.

I like the idea of "total work per person/per iteration" esp. since the pointing is meant to be a little retroactive, relative to previous amounts of work. We can give this change a little time to percolate and see what people think, and see if that would make the process a little clearer for folks

[aminomancer]

Yeah that makes sense. Sounds good!