* Group fancy indexing implemented. Group could be indexed by sequences
of indexes like list, tuple or array as well as sliced.
* Cluster class with hierarchical clustering implemented
* Group to_file and from_file methods implemented to store data in file
* Group copy method for shallow copy implemented
* StereoNet now accept Vec3 and Fault object as well for instant plotting.
* Ortensor updated with new properties E1,E2,E3 and Vollmer(1989) indexes
P,G,R and C. Bug in Woodcocks's shape and strength values fixed.
* uniform_lin and uniform_fol improved.
* asvec3 method implemented for Fol and Lin
* fol_plot property of StereoNet allows choose poles or great circles for
immediate plotting
* bootstrap method of Group provide generator of random resampling with
replacements.
* Group examples method provide few well-known datasets.
* Matplotlib deprecation warnings are ignored by default