Index-calculator

------------------

* more documentation
* properties to classes
* classes automatically call functions

------------------

* project-specific directory structure for cordex, cmip5 and cmip6

------------------

* adjustments fro automatically project-specific outfile name generation

------------------

* new indices implemented

* CD: number of cold and dry days
* CHDYYx: Maximum number of consecutive heat days
* CSDI: Cold spell duration index
* CW: Number of cold and wet days
* DTR: Mean of daily temperature range
* GD: Number of growing degree days
* GDYYx: Number of consecutive growing degree days
* HD17: Number of heating degree days
* PRCPTOT: Total precipitation amount
* RDYYp: Number of wet days with precip over percentile
* RYYpTOT: Precipitation fraction with precip over percentile
* TG10p: Fraction of days with mean temperature under 10th percentile
* TG90p: Fraction of days with mean temperature under 90th percentile
* TX10p: Fraction of days with maximum temperature under 10th percentile
* TX90p: Fraction of days with maximum temperature under 90th percentile
* TN10p: Fraction of days with minimum temperature under 10th percentile
* TN90p: Fraction of days with minimum temperature under 90th percentile
* WD: Number of warm and dry days
* WSDI: Warm spell duration index
* WW: Number of warm and wet days

------------------

* install data and tables via pip

------------------

* documentation on readthedocs
* tests
* new cli arguments added