GEOtop_ReadPlotRst: Visualize .asc raster map
In JBrenn/AnalyseGEOtop: Analyse GEOtop simulations

Visualize .asc raster map (GEOtop map output) with ggplot

1 2	GEOtop_ReadPlotRst(map, date, variable, layer, limits, legend, lowcol="#f7fbff", highcol="#08306b")

`map`	character, full path and name of .asc map to visualize
`date`	character, date characterization
`variable`	character, variable characterization
`map`	numeric, vector setting y-limits for plot
`legend`	character, legend characterization, e.g. "vol%" for soil moisture data
`lowcol`	minimum colour for visualization, default = "#f7fbff"
`highcol`	maximum colour for visualization, default = "#08306b"; default is creating a blue colour range