Gstlearn

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- Prevent NamingConvention from creating variables with empty name

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- Update R readme
- Add severity check for model validity (used before kriging)
- Standardize graphics in R and Python
- Rename name1 and name2 into namex and namey for correlation representations
- Parameterize the amount of Nugget (technically) added in SPDE
- Corrections in the API functions of SPDE method
- New test (cpp) for benchmarking SPDE features
- Allow processing target variable with NA in SPDE API functions
- Suppress class MatrixSquareDiagonalCst
- Suppress class MatrixSquareDiagonal
- Important warning: the Drift part of the Model Neutral File has changed.
- Drift* is not a serializable class anymore (only Model class is)
- Adding Legend to plot.varmod for plot.R
- flagCste replaced by flagCst everywhere
- The Enum called EDrift is abandoned
- Function dbRegressionByColIdx() has been abandoned (use dbRegression instead)
- Function regressionByUID() has been abandoned (use regression instead)
- Improvement of Table printout (row name not truncated anymore)
- New class 'ResReg' for storing Regression formula (AStringable)
- Integrate R documentation for functions in plot.R into the R package
- Names in plot.R and plot.py are standardized: using camel-writing systematically
- New method Db_fromPanda for creating Db from Panda Frame (numerical columns only)
- New method Db_fromDF for creating Db from data.frame (numerical columns only)
- Fix functions having "String()" default value in r (replaced by "")
- dbStatististics* functions refactoring (same function for printing and calculating)
- New design for VarioParam / Vario
- Possibility to convert variogram to external language (Python or R) for In and Out

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- Fix Issues 76 & 77
- Update official website URL
- Improve SPDE class API

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- Add How to cite in READMEs
- Add publish demos and publish doxygen workflows

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- SWIG typemaps robustification
- Publish acknowledge_gstlearn

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- Modify the angles in the legend of vario and model (from 'codir' to 'angles') + 1 angle if in 2D.
- Change the display of angles: it now lies between 0 and 360.
- New method to create several variogram directions specified by the list of their angles (limited to 2D)
- adding the possibility to define a DirParam using a 2D angle (prevails definition by 'codir')
- changing prototypes of setMean() and setVars()
- Fix Cross-validation in Simple Kriging with non zero Mean in Unique Neighborhood
- Changing ENUM EKrigOpt: option PONCTUAL becomes POINT
- Changing the internal definition (and storage) of DirParam
- Generalize the methode createFromVVD() for all concrete matrices