Change the filter-syslog rule for Debian to a broader pattern to
match more of the buggy power limit notifications generated by
newer Dell hardware.

Ignore buggy CPU core power limit notifications from new Dell
hardware in default Debian filter-syslog rules.

Append to the temporary file used for Dell warranty facts instead of
deleting it and recreating it (which defeats some of the point of
using mktemp.

This is the (old) master branch along with the fixes to the
cron file permissions that Russ made.