- add `zramSwap.algorithm` option, which allows to change compressor
declaratively. zstd as default
- add `zramSwap.swapDevices` option, which allows to define how many zram
devices will be used as swap. Rest devices can be managed freely
- simpler floating calculations
- fix udev race condition
- some documentation changes
- replaced `/sys/block/zram*` handling with `zramctl`, because I had occasional
"Device is busy" error (looks like zram has to be configured in predefined order)
- added `memoryPercent` and `algorithm` as restart triggers. I think, it was
a bug that changing `memoryPercent` in configuration wasn't applied immediately.
- removed a bind to .swap device. While it looks natural (when swap device goes
off, so should zram device), it wasn't implemented properly. This caused problems
with swapon/swapoff:
```
$ cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/zram0                              partition       8166024 0       -2
/var/swapfile                           file            5119996 5120    1

$ sudo swapoff -a

$ sudo swapon -a
swapon: /dev/zram0: read swap header failed

$ cat /proc/swaps
Filename                                Type            Size    Used    Priority
/var/swapfile                           file            5119996 0       1
```

This creates a dependency cycle when used with boot.tmpOnTmpfs:
basic.target <- tmp.mount <- swap.target <- zram-init-dev0 <- basic.target

This same fix is done already for tmp.mount

Fixes NixOS/nixpkgs#47474

This includes:

- fetch source from gitlab
- pname-version stuff
- change homepage
- correct license
  See: https://gitlab.gnome.org/World/deja-dup/blob/master/meson.build#L21

It is broken and no longer used.

It is no longer used.

A deprecation warning was removed in 427e749.
However, nixpkgs.tarball does evaluate without it now.

argparse is part of stdlib in 2.7 and 3.2+

deja-dup: 38.1 -> 38.3

zramSwap: allow configure compression algorithm + cleanups

pythonPackages: remove some packages representing outdated versions