cluster.addresses is slow

[sirpy]

Expected Result

What you expected to happen.
get first address/out of cluster quickly

Actual Result

What happened instead.
takes time for large clusters

Reproduction Steps

import blocksci,toolz
c = clustermanager.cluster_from_address(addr)
\#slow
print(toolz.first(c.addresses))

System Information

BlockSci version: 0.5
Using AMI: no
Total memory: 60gb

[hkalodner]

There are a couple improvements in v0.6 that should eliminate this issue.

[salber]

when is v0.6? due