868bdea18361a0ca78ef8343018354232747de36 got rid of "tahoe-lafs"

19dd3895d4e7bd5d6205c0eebaba1c843c871e37 added "tahoe-lafs-1_14" and
"tahoe-lafs-master".

8c7a61c658e32eaccf666e5fe818a996c36a988f explicitly uses 1_14 for privatestorage.

* Merge pull request #79 from PrivateStorageio/78.tests-in-nix-packaging
* Merge pull request #80 from PrivateStorageio/77.payment-metadata-handling
* Merge pull request #83 from PrivateStorageio/82.currency-parsing
* Merge pull request #85 from PrivateStorageio/84.currency-and-price

morph 1.5.0 fails to build with the golang runtime surrounding it

The nixpkgs fork already contains all of the changes our overlays were
responsible for - but as direct nixpkgs changes instead.