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[FIX] Use osg::Matrixf instead of osg::Matrix

[FIX] fiber stipples finally work now; there might still be a problem with the texture lookup at the voxel positions

[FIX] fiber stipples now actually render stipples again; there is still a problem with stipple directions

Previous commitment had some bug fixes. But it also said that some bugs dealing
with the surface segmentation still remained. This commit fixes them. The
errors consisted of not initialized member variables in some classes regarding
point instances of parameter space clustering and boundary detection.

Regarding the module "Surface detection by Lari" crashes appeared sometimes.
The reason was that the object containing the status bar thing (point classifier
class) was deleted before the progress was set to be finished.

Remaining bug:
The following bug could not be fixed short-time because it does not appear if
the module is compiled using the debug flag.
Shortly said sometimes the search instance even can not find a point using
coordinates of itself. Weird. I put setting the ID in the end of
WLariBruteforceClustering::addExtentCluster manually at least not to get stuck.
But still some groups result a bad result. No errors appear when compiling (cmake)
using the debug flag. Has to be fixed sometime later.

Having forgotten to commit memory bugs previously. Changes are commited here.

Main changes:
  - Multithreading for allocating kd-trees at 8 threads.
  - Fixed memory leak when kd-tree is destroyed. Not all memory was freed previously.
  - Added few point transformation features regarding automatical color adjustment.
  - Improved speed of the point file lading feature.
  - Fixed ReadLAS module
      - Previously it could only use greyscale color channel.
      - Made X/Y-sliders more intuitive

 * Implemented status bar feature for "Surface detection by Lari/Habib" and "Point Groups - Validator"

 *  - Just completed and fixed up things
 *  - Fixed bug contained in "Point groups - Transform". Originally there was a
 *    performance trouble during processing point data with very many groups.

 * Added some empty lines between methods in code and header files.
 *
 * Bugfix: Solved problem in point data saving that the coordinate precision was about 5
 * signs.
 *
 * Sebastian Eichelbaum wrote (18.09.2014, 11:46):
 * >> Hi Andreas
 * >>
 * >> Ich würde dich gern bitten darauf zu achten, dass du zwischen Funktionen
 * >> eine Leerzeile lässt. Das betrifft sowohl die CPP als auch die Header
 * >> files. Als Beispiel: WBmpImage.cpp. Dort hast du nach dem Konstruktor
 * >> eine Leerzeile gemacht, nach dem Destruktor und den folgenden Funktionen
 * >> jedoch nicht.
 * >>
 * >> Ansonsten ist dein Stil sehr sauber. Auch die Doxygen Doku ist sehr
 * >> ordentlich. Super.
 * >>
 * >> Gruß
 * >> Sebastian