Pyaudisam

* added MCDSPreAnalyser.computeSampleStats() to compute distance stats for samples to pre-analyse,
* fixed BalQual1 indicator computation (has been failing systematically for a long time !?),
* start again porting the notebook-based test suite to pytest (~20 % done),
* minor fixes and improvements to reports,
* stricter requirements.txt to reflect actually tested software platform.

* new how-to and how it works documentation with concrete runable scenarios and relevant field data,
* command line mode minor fixes,
* improved packaging.

* improvements, fixes and non-regression tests (notebook) for auto-filtered reports,
* new command line mode (__main__ sub-module),
* improved packaging.

The first really working version with its initial features:
* point transect Distance Sampling with MCDS 6.2 under Windows 7+,
* automated parallel run and reporting of multiple combinations of samples and analysis parameters,
* optional auto-determination of the left and right truncation distances (through a parallelized optimization system),
* automated filtering and sorting of results for easier choice at the end of the right analysis to select (among the numerous variants run), for each sample.