XDG_DATA_DIRS useage corrected (Fixes wrong site_data_dir e.g. under Kubuntu) #122
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The freedesktop specification states that $XDG_DATA_DIRS is a preference ordered list of where data should be searched (as opposed to where applications should store data). Therefore, for multipath=False, which is used by applications to determine a path to store data, this can lead to unintended paths, as can be seen under issue #121. This commit changes the default directory in this case to the distribution independent '/usr/local/share'.
Closes #121