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Tree on/off
: Depending on settings, the directory tree
              shows green and red or yellow
              (tree filtered) folders and projects. 
Green
for parts: These
                    are connected in the LinkDB.
Red
for parts: These are
                    not connected in the LinkDB.
Green
for directories:
                    These contain at least one part which has a LinkDB
                    connection.
Red 
for directories:
                    These contain no parts which have a LinkDB
                    connection.
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