Fix various warnings
Fix various warnings which gcc-9.2.1 (20190827) complains about. Their specifics can be found in the commits below.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Fix various warnings which gcc-9.2.1 (20190827) complains about. Their specifics can be found in the commits below.