Make glib_networking available for dwbem
flightgear: 2.10.0 -> 2.12.0 (and make it run again)

The current FlightGear expression doesn't work:

  bash$ nix-build -A flightgear
  /nix/store/3c47sibzb9h1vhnn0gnh692hkpjc5p5v-flightgear-2.10.0

  bash$ ./result/bin/fgfs
  ERROR: The path '/nix/store/3c47sibzb9h1vhnn0gnh692hkpjc5p5v-flightgear-2.10.0/lib/FlightGear' does not exist in the file system.

  Base package check failed:
    Version [none] found at: /nix/store/3c47sibzb9h1vhnn0gnh692hkpjc5p5v-flightgear-2.10.0/lib/FlightGear
    Version 2.10.0 is required.
  Please upgrade/downgrade base package and set the path to your fgdata
  with --fg-root=path_to_your_fgdata

We could probably make the 2.10.0 version run, but I had already
upgraded it to 2.12.0 before I made it work. It seems only the data dir
configuration was wrong/missing: FG_DATA_DIR="$out/share/FlightGear/".

Simgear must be in version sync with flightgear, hence the upgrade.

Most of the diff is because I rewrote the flightgear expression to what
I think is the "new style". I wanted to add a preConfigure phase but
didn't understand why this expression had custom phases. So I just
rewrote the whole thing to something I consider more readable.
update dwb to the latest revision
experimental/vsftpd

vsftpd improvements:
- intorduce one declarative list of options
- make docummentation strings more understandable and add missing options
  such as SSL/TLS support
- Use environment.etc."vsftpd".text because I can't think about any
  reason why a shell script should be used.
  That code was written in 2009.
Adding FriBID browser plugin

FriBID is an open source software for the Swedish e-id system called
BankID. FriBID also supports processor architectures and Linux/BSD
distributions that the official software doesn't support.

https://fribid.se/index.en.html

FriBID plugin is a firefoxWrapper plugin. Enabled by setting:

  nixpkgs.config.enableFriBIDPlugin = true
Merge pull request #1050 from bjornfor/flightgear

flightgear: 2.10.0 -> 2.12.0 (and make it run again)
Merge pull request #918 from edwtjo/fribid-1.0.2

Adding FriBID browser plugin
Merge pull request #1054 from pSub/dwb-update

dwb fix and update
Merge pull request #1060 from MarcWeber/submit/vsftpd

small vsftpd improvements
Adding forktty terminal connection/disconnection helper
freeciv: update to 2.4.0
Adding an attribute for the gtk freeciv too.
Add apparently missing option to vsftpd configuration
Updating Ekrhyper
Updating EProver to 1.8
Updating Compiz
Updating Sodium cryptography library to 0.4.3
Updating ASDF to 3.0.2.4
Updating CL-Launch to 3.22.1
Updating luarocks to 2.1.0