Merge from 1.7 branch, revisions 3389-3419. Only a valgrind warning in heapsort. Also skipped the date bump, which would cause too many conflicts. Will be changed later on manually.

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Bugfix: don't clear cursors in linux-device after the display has been closed already. Fixes crashes on application shutdown with more than one device.


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Fix wrong destruction calls, due to missing drop ion the attribute. Was a cyclic dependency on the video driver.

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Also fix the driver attribute setting in d3d driver.

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Add a generic attribute interface for querying video driver attributes which are not necessarily of type bool. This interface allows to check certain supported features, such as the number of user clip planes, supported lights and textures, MRTs, and other things. The interface might change in the future, but it's fully functional already. The supported attributes are listed in the API docs of the function.

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Change default blend mode in OpenGL to SRC_ALPHA,ONE_MINUS_SRC_ALPHA
Use less precision in 2dmaterial test.

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Allow to add folder archives with names without trailing slash. Added test to make sure the possible variants are checked.

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Add some more tests and fix a problem with transparency in the transparent_refelction_2_layers material as found by xDan.

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Remove non-existing files from project list. This avoids the dumb "need to recompile" dialogs in MSVC 2010. Also cleaned up some more things.

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Avoid the warning about unsupported format when creating FBOs, and try to be more clever with choosing the proper fbo format.

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Fix render state update for UseMipMaps flag in d3d drivers. Thanks to kvakvs for the bug ticket and fix.

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Fix deprecation warnings in PNG handling. Also added a warning message handler to get png warnings through the Irrlicht logger. Fix signed/unsigne comparison in WAL loader.

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