[MonoDevelop] Changing NUnit version used inside monodevelop

[Dan Liew]

> I got a bit sick of this too. I got a bit hacky and just dropped the 2.6
> assemblies over the top of the monodevelop ones and the gui/runner all
> still worked

Thanks for the quick response. What platform (e.g. Linux, Windows...)
did you do that on? I don't think that would work for me.

On my system NUnit lives in the "GAC" [1] as shown below (note the
listed dlls inside /usr/lib/mono/*/ are symbolic links to files in the
gac).

```
$ find /usr/lib/mono/ -iname '*nunit*'
/usr/lib/mono/2.0/nunit.core.extensions.dll
/usr/lib/mono/2.0/nunit.core.dll
/usr/lib/mono/2.0/nunit-console-runner.dll
/usr/lib/mono/2.0/nunit-console.exe
/usr/lib/mono/2.0/nunit.framework.dll
/usr/lib/mono/2.0/nunit-console.exe.mdb
/usr/lib/mono/2.0/nunit.util.dll
/usr/lib/mono/2.0/nunit.framework.extensions.dll
/usr/lib/mono/2.0/nunit.mocks.dll
/usr/lib/mono/2.0/nunit.core.interfaces.dll
/usr/lib/mono/2.0/nunit-console.exe.config
/usr/lib/mono/4.5/nunit.core.extensions.dll
/usr/lib/mono/4.5/nunit.core.dll
/usr/lib/mono/4.5/nunit-console-runner.dll
/usr/lib/mono/4.5/nunit-console.exe
/usr/lib/mono/4.5/nunit.framework.dll
/usr/lib/mono/4.5/nunit-console.exe.mdb
/usr/lib/mono/4.5/nunit.util.dll
/usr/lib/mono/4.5/nunit.framework.extensions.dll
/usr/lib/mono/4.5/nunit.mocks.dll
/usr/lib/mono/4.5/nunit.core.interfaces.dll
/usr/lib/mono/4.5/nunit-console.exe.config
/usr/lib/mono/gac/nunit.framework
/usr/lib/mono/gac/nunit.framework/2.4.8.0__96d09a1eb7f44a77/nunit.framework.dll.mdb
/usr/lib/mono/gac/nunit.framework/2.4.8.0__96d09a1eb7f44a77/nunit.framework.dll
/usr/lib/mono/gac/nunit.core.interfaces
/usr/lib/mono/gac/nunit.core.interfaces/2.4.8.0__96d09a1eb7f44a77/nunit.core.interfaces.dll.mdb
/usr/lib/mono/gac/nunit.core.interfaces/2.4.8.0__96d09a1eb7f44a77/nunit.core.interfaces.dll
/usr/lib/mono/gac/nunit.mocks
/usr/lib/mono/gac/nunit.mocks/2.4.8.0__96d09a1eb7f44a77/nunit.mocks.dll.mdb
/usr/lib/mono/gac/nunit.mocks/2.4.8.0__96d09a1eb7f44a77/nunit.mocks.dll
/usr/lib/mono/gac/nunit.core.extensions
/usr/lib/mono/gac/nunit.core.extensions/2.4.8.0__96d09a1eb7f44a77/nunit.core.extensions.dll
/usr/lib/mono/gac/nunit.core.extensions/2.4.8.0__96d09a1eb7f44a77/nunit.core.extensions.dll.mdb
/usr/lib/mono/gac/nunit.util
/usr/lib/mono/gac/nunit.util/2.4.8.0__96d09a1eb7f44a77/nunit.util.dll
/usr/lib/mono/gac/nunit.util/2.4.8.0__96d09a1eb7f44a77/nunit.util.dll.mdb
/usr/lib/mono/gac/nunit.core
/usr/lib/mono/gac/nunit.core/2.4.8.0__96d09a1eb7f44a77/nunit.core.dll
/usr/lib/mono/gac/nunit.core/2.4.8.0__96d09a1eb7f44a77/nunit.core.dll.mdb
/usr/lib/mono/gac/nunit.framework.extensions
/usr/lib/mono/gac/nunit.framework.extensions/2.4.8.0__96d09a1eb7f44a77/nunit.framework.extensions.dll.mdb
/usr/lib/mono/gac/nunit.framework.extensions/2.4.8.0__96d09a1eb7f44a77/nunit.framework.extensions.dll
/usr/lib/mono/gac/nunit-console-runner
/usr/lib/mono/gac/nunit-console-runner/2.4.8.0__96d09a1eb7f44a77/nunit-console-runner.dll.mdb
/usr/lib/mono/gac/nunit-console-runner/2.4.8.0__96d09a1eb7f44a77/nunit-console-runner.dll
```

[1]  http://www.mono-project.com/docs/advanced/assemblies-and-the-gac/

Thanks,
Dan.