This allows overriding supybot.reply.mores.instant for private messages, where
it is usually more tolerable to send multiple lines.
However, this still defaults to 1, in order to not be abusable by default.
instead of on NestedCommandIrcProxy.
ReplyIrcProxy._sendReply expects action=True to imply noLengthCheck=True, but only
NestedCommandIrcProxy.reply() enforces the latter, not ReplyIrcProxy.reply().
This crash was introduced in 3c1c4a69e9927bcc7265b1d77fd1ab49cb55090e by
moving NestedCommandIrcProxy's .reply() to ReplyIrcProxy.
I forgot to include these in 63eb6672eac794a9c39dec87db3aa45147e06974
(This is fine because noone but me touched these files since the initial
change in db7ef3f02517f9f2a3c56829a22b9fad3c36e374).
This is consistent with what we already do with commands; and generally
makes sense, as we don't want to re-send titles and others when cycling
on UnrealIRCd (which includes a chathistory batch when joining when
chmode +H is set, despite umode +B)
It's pointless and looks stupid.
It will look even more stupid when we enable multiline, because the
suffixes will be in the middle of the concatenated message.
Fixes c1d3bad64feca2529e29473f0ed8c622ad1937b1, which crashed with:
```
ERROR 2020-01-18T01:34:07 Uncaught exception in NickAuth._callCommand:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/supybot/callbacks.py", line 1337, in _callCommand
irc.errorNoCapability(cap)
File "/usr/local/lib/python3.7/dist-packages/supybot/callbacks.py", line 544, in errorNoCapability
raise Error()
supybot.callbacks.Error
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/supybot/log.py", line 368, in m
return f(self, *args, **kwargs)
File "/usr/local/lib/python3.7/dist-packages/supybot/callbacks.py", line 1359, in _callCommand
irc.error(str(e))
File "/usr/local/lib/python3.7/dist-packages/supybot/callbacks.py", line 1065, in error
raise ArgumentError
supybot.callbacks.ArgumentError
```
This fixes mostly everything, except a little bit from the test framework. I'm just saving this in case my computer or I is destroyed in an alien invasion, because this commit is worth hours of debugging.
This variable is a list of capabilities that are considered as 'private',
ie. the bot won't tell anyone but admins that a user has it, nor will the
bot give a list of users with this capability.
