WIP: community/py3-pip: make it easier to use as a pip517 builder
- community/py3-pip: make it easier to use as a pip517 builder
- community/py3-pip: disable testsuite to reduce dependency load
- community/py3-pip: add fish completion
- community/py3-pip: update comments on certifi
- community/py3-pip: use default shell completion functions
- main/fish: drop pip completion
- community/py3-flit_core: new aport
- community/flit: use py3-flit_core, replace pytoml with toml