* constant.cpp, src/libhw/vpl.cpp: Support for image environment
sources and spot lights in the real-time preview.
* mitsuba.cpp: Ability to run the 'mitsuba' execubable in arbitrary
locations on OSX while ensuring that it still finds all plugins etc.
* mtsimport: COLLADA importer support for ambient lights and 'polylist' meshes.
* scene.cpp: Create a default camera when none is specified in the XML file.
* constant.cpp, src/libhw/vpl.cpp: Support for rendering constant environment
sources in the real-time preview.
* glwidget.cpp, mainwindow.cpp: Support for Drag & Drop
* glwidget.cpp, mainwindow.cpp: The Mitsuba user interface now also
doubles as an EXR viewer / tonemapper. Drag an EXR file onto the
UI or open it using the File menu, and the image opens in a new
tab. Afterwards, it is possible to export the image as a tonemapped
8-bit PNG image.
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