C routines called as symbols and not name strings
 non-ASCII characters removed
 class checks doe with `inherits()`

updated references in generalised diagonalisations; improved/reimplemented as.logratioVariogram and as.logratioVariogramAnisotropy methods; minor edits at plot.logratioVariogramAnisotropy and variogramModelPlot.logratioVariogram

- url / appropriate usage
- reference in Description