* Find the complete key ID when uploading signatures
* Try that again
* Try splitting the right thing
* Don't do it for device keys
* Refactor `QuerySignatures`
* Revert "Refactor `QuerySignatures`"
This reverts commit c02832a3e9.
* Both requested key IDs and master/self/user keys
* Fix uniqueness
* Try tweaking GMSL
* Update GMSL again
* Revert "Update GMSL again"
This reverts commit bd6916cc37.
* Revert "Try tweaking GMSL"
This reverts commit 2a054524da.
* Database migrations
* Fix retrieving cross-signing signatures in `/user/devices/{userId}`
We need to know the target device IDs in order to get the signatures and we weren't populating those.
* Fix up signature retrieval
* Fix SQLite
* Always include the target's own signatures as well as the requesting user
* Delete device keys/signatures from key server when deleting device from user API
* Move loop to within database transaction
* Don't fall over deleting no rows
