$HOME/.bashrc provides TZ for *all* processes, resulting in proper date for Build_Log.log_date in remote_build_history via ssh (see also fe8f8f88a1d7);
uniform Isabelle settings -- avoid picking up different JAVA_HOME;
separate ISABELLE_HOME_USER (with its etc/settings);
explicit timezone for the sake of lxbroy10;
force fresh build;
basic setup for Isabelle cronjob;