Preparing editable biomes.

Most stuff doesnt update correctly now...
New Biomes are now displayed in the sidebar.
New biome infos are now passed to mapwidget
Removed some debug code.
New menu items
Started working on the biome info editor
Loading partially implemented
Saving biome infos implemented
Added biome list to biome editor
We don't need to pack the treeview here

Is already in a scrolled window
TreeView is working :)
Adding, deleting and modifying biomes works!
Biomes can be moved around
onDel re-selects the current entry
Buttons of biome list are now (de)activated, depending on index
Biome editor is now opened by a button in the sidebar
Added some tooltips
Removed test.biomes
Merge branch 'editable-biomes'
Replaced some menu items with stock items