Give the AppendDebugMethod() declaration a set of default values for
all parameters after the first. (It uses `""` and `-1.0`, which are
what callers were passing in anyway.) This way, callers have the
_option_ to eschew this kind of thing:
```
ZmqLogger::Instance()->AppendDebugMethod("Message", "start", start,
"length", length, "", -1, "", -1, "", -1, "", -1);
```
instead, they can use the functionally equivalent:
```
ZmqLogger::Instance()->AppendDebugMethod("Message", "start", start,
"length", length);
```
Passing meaningless args is the compiler's job, not the programmer's.
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