[picocontainer-dev] named containers (for debugging only)

I've added setName to DPC and the other container impls.

toString() now prints strings like...

   foo:2<I<D<bar:3<|

where 'foo' is the name of the child container, and it has 2 component  
adapters in it.
and 'bar' is the name of the parent container, and it has  3 CAs in it.

   '<I' marks an immutable guard
   '<D' marks a container impl that delegates to another.
   '<|' marks the end of the line (EmptyPicoContainer)

I'm working through the NanoWar stuff of course, and this aids  
debugging.  It all looks good as stepping through breakpoints.

- Paul

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