WIP commit
add raster support; strip obsolete code
support individual rasters
remove obsolete stuff
skip rasters which already have been added as part of a rasterset
skip rasters which already have been added as part of a rasterset v2
small finetuning
add click support; add caching
use a more efficient tuple instead of a dict for tree nodes
fix a bug
better tree querying
fix graphs
add values csv download
add values csv download
rm obsolete code; fix parent-child relation in node tree
beautify names and sorting
Merge pull request #7 from lizardsystem/wip_tree_structure

Use a tree structure to select map layers