With today's removals of gnutls26 and libgcrypt11 from jessie the respective transitions have been finished. Thanks to everybody who help accomplishing this, package maintainers and the release team, with a special thanks to Emilio.
It started from a bad position: Since 2011 we had co-installable gnutls26
and gnutls28 in Debian with separate (and conflicting) development
packages. Simply providing libgnutls-dev from gnutls28 was not possible
because there are some incompatibilities and because we had
license problems.
So we ended up gradually switching packages over by sourceful
uploads.
Looking back, this worked both well and badly: On one hand it played nicely with testing migration. It did not break a lot of important packages at a single time or block packages from migration to testing. On the other hand over a 100 sourceful uploads are a lot, and the transition took a long time.