Merge pull request #6 from rburchell/tests

[mapplauncherd] Remove obsolete tests.
Merge pull request #8 from rburchell/single-instance

[mapplauncherd] Remove X11 dependency from single-instance.
[mapplauncherd] Remove splash support.

This feature only encourages poor application interactivity: anything which is
sufficiently slow to require a splash screen should be made faster instead.

In addition to that, the feature is poorly implemented (X11-specific), and thus
useless. Rip it out, and remove the last dependency on X11 from applauncherd.