[Change] moved statistical logging to record_hits() function
[Change] quarantine() function borrows stat file data from record_hits
to reduce calls to stat
[Change] more extensible cleaner rules with additional input arguments:
$1 file path, $2 signame, $3 òwner.group, $4 file_chmod, $5 file_size,
$6 file_md5
[Change] added additional fields file_size and file_md5 to quarantine
info file
[Change] added caching support for import_config_url with
import_config_expire to control expiry interval
[Change] stricter handling of variable definitions which contain dynamic
variable values