Make node.log or RED.log available in the function node

[knolleary]

Previously discussed, without conclusion, here:

Survey: logging to debug sidebar

Hi, one of the long-standing quirks of the Function node is that the only way to get a message to appear in the Debug sidebar is to use node.warn or node.error. The problem with this approach is it puts what should be debugging comments into the log at warn/error levels. That is not a good thing for systems that monitor warn/error levels and automatically raise alerts when they happen. The question is: how can we improve this? It isn't a hard problem to solve, but there are a few different wa…