Config file for download cache settings #220
Merged
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This adds a new config file in home. This will come handy to set some paths once (and once for all).
This config file is different from the params.cfg in that it stores information which is going to be consistent accross all runs (e.g.: topo data, climate data, etc).
I also had to revert some of your changes @TimoRoth because the concept of a single download cache directory is not possible for these data. Your solution was definitely more elegant, but the data we download is structured and can be used outside oggm. This change allows to keep a structure in the downloaded data. Note that the default config is to have a single cache directory with all data inside, so exactly what you had.