The full list of time samples is rarely useful outside of debugging.
The node's time offset, however is useful for discovering local clock
drift, so it's displayed in all logging modes.
This RPC is exactly identical to getblockcount. This duplication
dates back to commit 22f721dbf2 when
Satoshi created the RPC interface.
There's no need to have both, so we standardize on "count" which
matches the naming convention in getconnectioncount.
Following the tradition established with previously deprecated APIs,
getblocknumber continues to work, but it's not listed in the help
system.