- Add a (disabled) section to block various Facebook tracking URLs
- Reported by Dan Stahlke in #3421764.
+ If the --user argument user[.group] contains a dot,
+ always bail out if no group has been specified.
+ Previously the intended, but undocumented (and apparently
+ untested), behaviour was to try interpreting the whole
+ argument as user name, but the detection was flawed and
+ checked for '0' isntead of '\0', thus merely preventing
+ group names beginning with a zero.