v0.7.1

misc v0.7 deprecation fixes

v0.7.0: tweak tag generation (#279)

* tweak tag generation

This does 3 related things
1. Re-enables void tags by providing `nothing` as function argument
2. Allows opt out of tag checking via `Val{false}()` argument.
3. Simplifies the Hessian to use the same tag (which is useful for my own purposes of computing Riemannian metrics, but also makes the code a bit cleaner).

* add docs

* derivative fixes

* add tests for tag checks

* add tag docs

v0.6.0

switch DiffBase dependency over to DiffRules/DiffTests/DiffResults, r…

v0.5.0

more specific link

v0.4.2: #207, but rebased against master (#214)

* fix wrong partials multiplied in FMA

* use more fma