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[CHANGE] Renamed fiber clustering module and made use of trigger properties as well as removed useless asserts (but not all of them), also removed unused code

[FIX #224] Now the clustering does not dying when there is already a file (nothing is saved) or when there is no permission (should catch an exception)

[FIX] Some modules overwriting WModules activate methode did not made a call to WModule::activate() before returning.

[CHANGE] Similarity metrics are now still accessible via the Strategy Pattern but they now use boost::function which is in terms of performance the same as previous. The main advantage is now there is no abstract (public) class WZhangMetric which may have be missused, and code reduction like hell!

[CHANGE] now datastructures directory for dataHandler dependent data structures exists to make common not dependent on anything!

[FIX] Bug in WBresenham algorithm when antialiasing is ON but the voxel to antialias is on the boundary. (The solution was, just to leave boundary voxels unantialiased)
[ADD] Now logger may also be used with the string_utils operator<< functions for std::vector and std::list
[CHANGE] WMFiberClustering is now much more thread safer

 * Merged the two Fiber dataset idioms: One fast for displaying fibers named now WDataSetFibers and one slow for clustering et. al. The latter is now called WDataSetFiberVector.
 * Merged also the two fiber loaders into one WReaderFiberVTK generating a WDataSetFibers
 * Merged the two Display modules: Basically the old WMFiberDisplay2 is now the WMFiberDisplay module. The other display module seems to be obsolete, but be aware the the new module has some issues with thread safety and responsiveness.

Note there has to be done the conversion from a WDataSetFibers to a WDataSetFiberVector. This is not commited yet, but will be soon.

[ADD] WProperties and WProperty support now dirty flags. You may use this when your module is calculating stuff while the gui is responsive. The module may need member variables while the gui should be responsive. Since there is no disable feature for the gui of modules yet, this is a workaround at first. fiberCulling is the first module using this feature.
[CHANGE] Improved threadsafeness of the fiberCulling module: now the GUI thread is responsive while computing the fiber culling

[ADD] some missed documentation of WBresenham_test.h

 * basic fascillities for the bresenham algo:
  * generating voxel dataset and bounding box of a cluster
  * drawing voxels and fibers
 * module connectors just support one cluster ATM

 TODO: implement bresenham

[FIX ] Bug: "changing the proximity threshold in WMFiberClustering did not really apply the new proximity" is fixed.

[ADD] Now hard coded helper file /tmp/pansen.dist has gone for freedom. @Alex: I do not want ANY pansen!

 * some unit tests and disabled unit_test warnings from cmake for those where no test are neccesarry
 * fixed some style violations

 * Since its christmas this is not related to any ticket
 * renamed run script in walnut, and walnut into walnut-bin
 * fixed wlanut script to support also PATH variables without current path
 * moved some utils into the utils directory. Maybe we should merge this with common later?
 * some info messages for the config file reading

 * switchted to the brand new now available module connection thing to get Datasets (so nasty while loop are gone for freedom :)
 * OSG group nodes should be destroyed in all Modules. BTW: the Clustering module want to use later the display module too

- also see ticket #142