mypkgs builts on nixpkgs-unstable to get a current nvim version.
Luckily this kind of mixture of various versions is yet another
strong suit of Nix.

Weirdly I did not find a better way to pass a userspace "<mypkgs>"
channel throughout the home-manager expression tree.

i.e. adding a "mypkgs ? import <mypkgs> { }" argument to all expressions
     failed somewhere inside Nix.

However this way has the benefit of making it very easy to augment the
derivations maintained in pkgs.kummerlaender.eu with additional packages.

Allows for convenient management of non-project-specific shell environments.

Task scripts and desktop shortcuts are now autogenerated using a
friendly list of tasks in `gui/tasker.nix`.

i.e. a separate rofi launcher is unnecessary as the generated desktop
files are automatically picked up by stock rofi.

This is nice.

`tasker` opens a rofi selection of all scripts found in `~/.local/share/tasks`.
This is useful for launching e.g. project specific nix-shells, vim instances and so on.

Actual tasks are not included at this point as they are still quite rudimentary.

This vision is that this develops into a Nix and XMonad integrated
project manager that:

* Automatically clones the project repository if it is not already available
* Allows for (optional) central management of nix-shell derivations
* Allows for easy isolation of project-specific UI utilities
* Enables convenient launching of build and test scripts

Enables installation of modem-manager-gui derivation to be restricted to asterix.
XMonad config will also get host-specific sections in the future.

Default CLI editor is currently still Vim, mainly because cs-exact
doesn't work correctly in Neovim. Neovim-Qt is preferable to GVim as the
latter has ugly pixel glitches on my system (maybe related to
proprietary NVidia drivers? This was not a problem on the x220)

The neovim-qt derivation is built using a custom nvim derivation which
in turn uses the global vim configuration managed in /etc/nixos/pkgs/vim.