blockpool stability fixes:

- follow up locks and fix them
- chainManager: call SetQueued for parentErr future blocks, uncomment TD checks, unskip test
- make ErrIncorrectTD non-fatal to be forgiving to genuine mistaken nodes (temp) but demote them to guard against stuck best peers.
- add purging to bounded nodeCache (config nodeCacheSize)
- use nodeCache when creating blockpool entries and let non-best peers add blocks (performance boost)
- minor error in addError
- reduce idleBestPeerTimeout to 1 minute
- correct status counts and unskip status passing status test
- glogified logging

errs/errors.go

@@ -69,7 +69,7 @@ func (self *Errors) New(code int, format string, params ...interface{}) *Error {
 
 func (self Error) Error() (message string) {
 	if len(message) == 0 {
-		self.message = fmt.Sprintf("[%s] %s", self.Package, self.Name)
+		self.message = fmt.Sprintf("[%s] ERROR: %s", self.Package, self.Name)
 		if self.format != "" {
 			self.message += ": " + fmt.Sprintf(self.format, self.params...)
 		}
@@ -81,15 +81,8 @@ func (self Error) Log(v glog.Verbose) {
 	if v {
 		v.Infoln(self)
 	}
-	//log.Sendln(self.level, self)
 }
 
-/*
-func (self Error) Log(log *logger.Logger) {
-	log.Sendln(self.level, self)
-}
-*/
-
 /*
 err.Fatal() is true if err's severity level is 0 or 1 (logger.ErrorLevel or logger.Silence)
 */