Update nixUnstable
perl-MooX-Types-MooseLike: add version 0.27
perl-Throwable: update to version 0.200010

The old version is no longer available for download
perl-Email-Sender: update to version 1.300014

The old version is no longer available for download
perl-Crypt-RandPasswd: update to version 0.06

The old version is no longer available for download.
perl-packages.nix: strip trailing whitespace
pdfjam: update from 1.20 to 2.08
lib: Use arithmetic operators rather than builtins.add etc.
Remove obsolete checks for missing primops
Use new primops
Replace hasAttr/getAttr calls with the ? and . operators

For NixOS evaluation, this gives a ~21% reduction in the number of
values allocated and a ~4% speedup. It's also more readable.
Eliminate some optionals/optionalAttrs calls on the hot path
iperf: Add major version 3
network-interface: Add extra bond options
network-interfaces: Bonding fixes
fetchurl: fix mirroring after ecf5a08831f18e3ae2fc857c70d60fc11f622dd6