LEDA adaptors for node_array, edge_array

[Douglas Gregor]

LEDA has constructs similar to property maps, called node_array 
and edge_array, that allow the user to create external mappings from 
vertices or edges to user-defined data. Both classes are templated 
over the data type T. 

The BGL LEDA adaptors should provide a wrapper for these data 
structures to make them into property maps, so that LEDA graphs 
and LEDA's form of external property maps can be used with BGL 
algorithms. 

[tessarakt]

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