- improve variable for logging from "debugLevel" to "logSeverity" (print logging messages which have a severity larger equal the then given value; so; "nsf::configure debugLevel 0" will print everything, and "nsf::configure debugLevel 3" will print just error messages and omit warnings etc.) - this is not a change in sematics, but removes some confusion in the code. therefore the configure name was not changed - Remove 2 occurrences of deprecated Tcl Call Tcl_AppendResult() in nsfStubLib