consolidated main cronjob server on virtual machine together with build_log database;
eliminated special tricks for Gentoo;
import plain_identify logs, export all logs for backup;
run build_release, build_history_base in parallel to remote_build_history tasks;
SHELL=/bin/bash
MAILTO=makarius
03 00 * * * $HOME/cronjob/self_update
17 00 * * * $HOME/cronjob/isabelle/Admin/cronjob/main -f > $HOME/cronjob/run/main.out 2>&1 || cat $HOME/cronjob/run/main.out