[graph] [serialization] serialized descriptors

Hello,

there is utility code for serializing an adjancency_list graph to an 
archive in the BGL. But I wonder about two things:

1) I have a list of descriptors in my program. This list is a selection 
of vertices. If I want to serialize my program's states, I need to 
serialize the graph as well as this selection. This means I have to 
serialize references to vertices. Now AFAIK I cannot simply serialize 
descriptors, because they essentially are pointers. I need a persistent 
ID. Is there existing functionality for this? If not, I have to either 
use one of the vertex properties as ID, or autogenerate IDs (for 
example, by using casting the descriptors to an intptr_t and using this 
value as ID) and upon deserialization use these for mapping the right 
descriptors back into the list.

2) One vertex property is a map of boost::any values. map < string, any 
 > to be exact. Does the BGL serialize the properties? If so, how does 
it deal with boost::any constructs?
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