runtime debug support

[dch]

Currently debugging is an all-or-nothing compile time option, unclear if there is also a performance limitation. It would be super helpful to be able to do -v a few times and see more & more debugging info, particularly initially around acquiring network information, and establishing connections to leaf nodes which is usually what most people are trying to work out.

[adamierymenko]

That's already partly implemented. The next version will have remote diagnostics.