bugfix in hp.get_plot; improvements in probing._parallel_probing; nifty_tools.py added; version number updated.
imports cleaned up; minimizer retrun convergence level.
typo-bug in invertible_operator fixed.
recursion bug in invertible_operator fixed.
bug in invertible_operator fixed.
probing forwards kwargs 'quargs'.
bug in conjugate_gradient._without fixed.
several minor fixes; version updated.
several fixes; demo_wf added.
several minor ajustments in docstrings and output.
comments and real-array-glitch corrected.
R.den check moved to _(de)breifing.
nkdict_fast implemented.
probging restructured for shared memory usage.
version update.
Merge pull request #4 from mselig/develop

version update.