CRAN Release 5.0.4

This release contains a new default theme for the graphical user interface as well as some minor bugfixes, improvements and code-optimization. Version 5.0.4 also contains two new functions (argus_rankswap() and argus_microaggregation() that use c++-code directly from mu-argus for comparability reasons. Furthermore, there is a new function riskyCells() that allows to compute "unsafe cells" as in mu-argus.