Fix rare peer test NPE if we did not set charlie's hash

as suggested by drzed

Don't show zero send/receive BPS after 15 sec idle; show smoothed value,
so display isn't mostly zeros.
BPS sorters will now work correctly and totals are more accurate.
Pass now to send/receive BPS methods and BW estimator
Comment out UDPTransport.noteSend()
Fix alignment issue in NTCP peers table
Show 0 instead of 0.00 for zero BPS
Change rounding mode of formatters

add i2pd console to list

to be only what stats.i2p needs
Disabled until next release, to preserve dev build anonymity,
tested while enabled
Commented out unsed code
ref: http://zzz.i2p/topics/3515

Command error handling and message improvements
Implement simple HELP command
bump -1

Waste of space and probably slower

Update checklist to specify bootclasspath, so these are caught in the future
bump -16-rc

Reported by drzed

use a containsKey()+put instead of putIfAbsent because putIfAbsent is not present in Java 8, thereby breaking Maven builds

Set limit to 0 if vmCommSystem
i2ptunnel: Do not retry if session limit exceeded

only if configured for 6 or more tunnels

Reported on Windows 10
ref: http://zzz.i2p/topics/3500

This will probably also reduce builds at startup.
Limits may require tweaks after further testing.

Never let SSU1 test result be symmetric NAT, it's probably charlie
Don't use SSU1 test if we think we are symmetric NAT
Cleanup two places to call new fail() method

- Send msg 6 even if msg 5 is not received, after a short delay, to detect symmetric NAT
- Prevent test result of symmetric NAT if Charlie is the one that appears to be symmetric natted.
- Mark if Charlie unreachable if apparently symmetric natted.
- Do not treat a different IP but same port as symmetric NAT
- Increase msg 6 retransmission frequency
- Ignore msg 5 received after sending msg 6
- Call externalAddressReceived() on reception of msg 7
- Add javadoc for testComplete() state machine

Most changes only affect SSU2; some SSU1 changes to follow.

ref: http://zzz.i2p/topics/3489

Rename isSnatted() to isSymNatted()
Minor rewrite in PeerState2.gotTermination()
Remove dead peer when pinging fails in intro manager
Cleanup ip length check in externalAddressReceived()
Log tweaks

kill the new one instead

Primarily for Peer Test and Relay, so the test or relay can be aborted.
Previously, sends on a dead PeerState2 were not detected or prevented.
Catch IOE throughout where necessary around all build() calls.
Add a fail() method in PeerTestManager

SSU2 peer test state add alice IP/port back to logging, needed for debugging

which could be different, esp. with temporary IPv6 addresses.
Could result in an erroneous SNAT result.
Add logging if different when starting test.
Check address block received in msg 6, use in logging only for now
Add logging of address block received in msg 7 if different than expected (possible SNAT)
Remove isValidPort() check in msg 5 recently added, already checked in code above
Add notes about possible externalAddressReceived() calls from peer test
Add notes about our address in PeerState2

Simplify check in EstablishmentManager.sendConfirmation(), we don't need to validate
RemoteHostId IP again, we did it before connecting.
Add check that received port is >= 1024.

Already hidden on /configpeers, so don't waste the space

and also use those states for when to publish B cap

Check for dup msg 5
Store the time msg 6 sent
Ignore msg 5 after sending msg 6
Ignore msg 7 before receiving msg 4
Validate ip/port in msg 7
Update rcv times for dups
Log tweaks

At startup, and for IPv6 so it doesn't lose out to IPv4
PeerTestEvent logging cleanup