A whole lot of Sqlite netconf master work, and some fixes elsewhere in the code.

node/Identity.cpp

@@ -155,6 +155,9 @@ std::string Identity::toString(bool includePrivate) const
 
 bool Identity::fromString(const char *str)
 {
+	if (!str)
+		return false;
+
 	char *saveptr = (char *)0;
 	char tmp[4096];
 	if (!Utils::scopy(tmp,sizeof(tmp),str))