Change mode for cron files to 600

Hi,
I edited the cfengine_stdlib.cf about the permissions on cronjobs.

Use 600 mode for crontab files in cronjob function to avoid this error on Ubuntu:
" (root) INSECURE MODE (mode 0600 expected) (crontabs/root)"

Using another mode than 600 makes the crontab to be ignored.

Regards

Remi Debay