log output: initial move to DATADUMP

This moves most of the biggest log outputs from DEBUG and INFO to DATADUMP. Turns out, there weren't all that many.

Next I'm reevaluating the log level assigned to each output. Ideally I'm thinking the default log level should be INFO (20) and should give the user a good picture of what their node is doing on the network without being too much or too many to read in realtime.
I suppose.

Do we have a coding style for quotes? Our existing code is a bit random. I'm a fan of double quotes for strings and single quotes for identifiers, but I'm an even bigger fan of following a coding style.

I'd prefer to define a style and stick to it even it it means having a few backslashes.