* accounts, cmd, eth, ethdb: port logs over to new system
* ethdb: drop concept of cache distribution between dbs
* eth: fix some log nitpicks to make them nicer
This command was meant as a hackish way to upgrade our chain database way back
when nobody cared for live updates and the size of the database along with its
import times was small. With the current database weighing hundreds of GBs and
processing times of many days, this command is just ludicrous.
These changes make prompting behave consistently on all platforms:
* The input buffer is now global.
Buffering was previously set up for each prompt, which can cause weird
behaviour, e.g. when running "geth account update <input.txt" where
input.txt contains three lines. In this case, the first password
prompt would fill up the buffer with all lines and then use only the
first one.
* Print the "unsupported terminal" warning only once.
Now that stdin prompting has global state, we can use it to track
the warning there.
* Work around small liner issues, particularly on Windows.
Prompting didn't work under most of the third-party terminal emulators
on Windows because liner assumes line editing is always available.
Interrupting import with Ctrl-C could cause database corruption
because the signal wasn't handled. utils.ImportChain now checks
for a queued interrupt on every batch.