Add new tool to create an aggregated global exposure dataset by merging previously exported aggregated SpatiaLite databases
For generating global images based on exposure data and to provide a coarse but global model in one file, we need to develop a tool that can combine a global set of existing SpatiaLite databases and produce one SpatiaLite database at the desired aggregation level. For this, all existing databases should be temporarily aggregated to the desired level and then added to the output database. This tool should consider all aggregation options so that multi-resolution global grids are also possible.