Include MaxVersion in Cluster Config message
Logger should use stdout instead of stderr
discosrv: Tunable limiter settings
Refactor node ID handling, use check digits (fixes #269)

New node ID:s contain four Luhn check digits and are grouped
differently. Code uses NodeID type instead of string, so it's formatted
homogenously everywhere.
Merge branch 'v0.8'

* v0.8:
  Increase deadlock timeout, make configurable (fixes #389, fixes #393)
  Remove spurious debug output in .stignore handling
  Connection notices are informational
  No need to hold a write lock in Override
  Don't whine about unexpected EOFs
  Ensure correct version string format

Conflicts:
	model/model.go
Fix linux/freebsd/windows compilation
XDR incorrect encoding of uint16; tests and benchmarks
Improve XDR performance
Tone down UPnP not found message (fixes #402)
Add temporary debug logging for #344