gtMakePoleFigure/gtMakeInversePoleFigure : used only varargin input, improved speed, introduced the function 'gtFindPolesInRange' and used 'gtCalculateDensityPhiPsi'. It is still needed a way to draw labels to the poles in the specific phi/psi range...an automatic way of course!

Signed-off-by: Laura Nervo <laura.nervo@esrf.fr>