Fourth patch for proposal 121

[Karsten Loesing]

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Hi Nick,

this patch 4a now contains two more changes as discussed on IRC:

1. The signatures of directory_initiate_command_routerstatus() and
directory_initiate_command() are left unchanged. Therefore there are now
two more functions especially for hidden service requests ending in _rend().

2. The various connection and circuit structs don't reserve memory for
hidden service requests any more. Now there is a new struct rend_data_t
that holds all hidden-service-specific data and that is pointed to by
those data structures. I also moved the memory for storing rendezvous
cookie and hidden service identifier on service side to that new struct.

- --Karsten
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