Add support for the PERMUTATIONA function to kspread
completed by: goffrie
mentors: Marijn Kruisselbrink
Among the spreadsheet functions that are currently not supported by KSpread but are defined in the OpenDocument specification (which kspread aims to fully implement at some point), is the PERMUTATIONA function. PERMUTATIONA is very similar to the currently supported POWER function, it mostly puts some extra constraints on the input values (that should result in an error as output value), so for the implementation the current POWER implementation should be helpfull.