Merge from 1.7 branch, revisions 3535:3557. MS3D optimization and changes update. Skipping date updates which have been made in this repository already.

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Fix warning message in CAnimatedMeshSceneNode
Change C-cast to reinterpret in CIrrDeviceLinux

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Fix reading zip files with incomplete local file headers. These require proper support for the central directory, which is now implemented. Thanks to hiker for supplying such a file.

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Fix scene files to reflect relative texture names, and disabled the according test until the texture deserialization is actually fixed.

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Fix bone-vertex IDs to be correctly indexing into the global vertex array. Before, mixed mesh/bone sections broke the correct relation. Thanks to Auria for finding and fixing the bug.

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Add random number generator frand() for interval [0..1] which fixes many issues with current usage of rand() in the particle emitters. Thanks to vitek for the initial ideas, CuteAlien for the new method suggestions, and Auria for bringing this up again.
TODO: Test cases, which would need a public interface to this class first...

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Add a test for proper file loading from archives, despite two files in the archive have the same name.

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Move debug messages into ELL_DEBUG space.

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Fix writeScene change in order to write the given node and its descendants, not only the list of children to the scene file.
Add support for loading a scene file as childs of a given node. This will ignore the scene attributes and load all nodes of the scene, storing them as children of a given parent node. The rest will stay as before, including the default behavior to load scene attributes and all nodes directly into the scene manager.
Test cases added for both methods loadScene and saveScene. In order to find a node in the example scene from tutorial 15 I have added a name and ID to one of the scene elements.

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Fix setMesh for skinned meshes, as reported by wing64. The joints cache was not updated, and hence the node reported and returned wrong joints.
Added support for resetting the transition time to 0.
Fixed some method names (correct camel case, create replaced by add, upper case fixed) in skinnedMesh.cpp

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Fix OpenGL texture matrix setup, found by pc0de. Sorry for the inconvenience, was probably very late when I changed that code.

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Real fix for the MRT problem. Last time only parts of the problem were fixed. Now, all RTT states should be fixed again. Also, test results are commited and work for both drivers.
Also changed the FBODepthTexture implementation in that it will not create another FBO, but only the depth/stencil texture or renderbuffer.

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Fixed the reference images, which have changed due to the text position changes in the 1.7 branch. We are using long texts, hence an empty line had been added in the beginning. This was wrong and fixed in the 1.7 branch already. Now our test had to be fixed as well.

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Merge from 1.7 branch, revisions 3449-3513. createImage fixed. Many GUI fixes. Saved particles can be loaded again. Volume light, skydome and water scene node updates. Let hw mapping hint be loaded. D3D reset fix, now terrain scenes can resize screens again.

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Add a new texture lock mode for write-only access. The lock method has changed for this. Support is only implemented under OpenGL so far.

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