Fix GiftAidOverviewController

Closed 📌 Finish the declaration forms Active as a duplicate of this. The only extra thing it had was the addition of the gift aid user tab, which I just added to the IS here.

OK to check this in? Then I'll update the roadmap, and I'm ready for you to have a look / test. After that I suggest we have another planning discussion.

I did the roadmap. Shall I create a first alpha release for you to test with?

Sure, pls do an alpha

Thanks. Done Alpha.

There is now a second alpha as the first was missing this issue. Sorry I forgot to "git pull" after switching back to 1.x to add the tag.