* New tunnel build process - does not use the new crypto or new peer
selection strategies. However, it does drop the fallback tunnel
procedure, except for tunnels who are configured to allow them, or for
the exploratory pool during bootstrapping or after a catastrophic
failure. This new process prefers to fail rather than use too-short
tunnels, so while it can do some pretty aggressive tunnel rebuilding,
it may expose more tunnel failures to the user.
* Always prefer normal tunnels to fallback tunnels.
* Potential fix for a bug while changing i2cp settings on I2PSnark (thanks
bar!)
* Do all of the netDb entry writing in a separate thread, avoiding
duplicates and batching them up.
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