- Hide initLoggingNamespace. getLoggerForNamespace should be used
instead.
- setLevelForNamespace now calls getLoggerForNamespace to ensure the
namespace exists when a caller tries to set the logging level.
Previously it was possible to call setLevelForNamespace before the
namespace was initialized, meaning that the setting had no effect.
This is especially problematic for cases where a library is using
namespaced logging with the filter set to a high level by default.
The code using that library may want to enable debug logs, and is
likely to call setLevelForNamespace in initialization code that runs
prior to the library code which instantiates the namespace.
