DarkRadiant pre-release tests

The following pre-release tests (UAT) should be performed before a new DarkRadiant release is uploaded to SourceForge, to ensure that no regressions of functionality have occured during development.

Map handling

1. Load a large map, like askave or mansion_alpha. The application should not crash or go into an infinite loop. When the map is loaded, it should be displayed correctly, without anything obviously missing.
2. Save the large map to a new test file, then load another large map. Reload the newly-saved first map. All maps must load correctly.
3. Enter Doom 3 and compile (dmap) the newly-saved large map from the previous step. The map must compile and be playable (assuming that the original map was compilable).

Rendering

1. Create a new map. Add a brush, and texture it. Add a light in such a position as to illuminate this brush, and enter lighting mode (F3). The brush must be illuminated by the light.