File naming:
 * Name the file after the package containing the daemon/program
   emitting the log entries
 * Append .changes if the file completely replaces the one currently in
   Debian officially (either provided by logcheck or the package itself)
 * Append .tmp if the entries are not really meant to be included
   officially in Debian
 * Nothing appended means the entries are additions to (possible)
   existing entries for the package
 * Entries in ignore.d.workstation are additions to ones in
   ignore.d.server, not replacements

Coding style of entries:
 * Be strict! Avoid ".*" (have a look at bind entries for inspiration)
 * Merge similar lines with (foo|bar) constructs
 * Append "$" if possible (but only when entry is strict!)
 * comments are allowed: First character of the line must be a #