Add getnetworkinfo support to btcctl.

ok @jrick
Use the new bloom Reload API.

This fixes a race caught by the go race detector.
ok @jrick
Pass the correct types for signrawtransaction.
Make btcctl errcheck clean.

This commit explicitly ignores errors that were already intentionally
ignored in btcctl by using an _ to make the errcheck utility happy.  It is
also nice to make it explicit that the error is being ignored
intentionally rather than leave questions of whether it was accidentally
forgotten.
btcctl: Fix createrawtransaction amounts.

These were being counted in satoshis, when the JSON object should be
containing JSON numbers, counted in BTC.
Fix some typos throughout repo.