taalo-build: Switch back to instantiate + realize

I refactored the two tools a while ago but eventually rendered
taalo-realize useless, because it doesn't copy the derivation to realize
to the remote host.

This is done now, plus the taalo-build command now makes sure that we
instantiate on the local machine, thus speeding up builds a lot (except
maybe if the local host is under very high load).

In addition I added an indirect gcroot inside a temporary directory, so
that we don't get into a race condition when garbage collecting between
instantiate and realize.

Instead of nix-copy-closure, I now use "nix copy", which properly
supports the ssh-ng store backend. However I didn't use "nix build" and
friends, because these commands still lack a few features.

Signed-off-by: aszlig <aszlig@nix.build>

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