clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
03 00 * * * $HOME/bin/checkout-admin
17 00 * * * $HOME/bin/isatest-makedist
01 08 * * * $HOME/bin/isatest-check
04 23 31 1,3,5,7,8,10,12 * $HOME/bin/logmove
04 23 30 4,6,9,11 * $HOME/bin/logmove
04 23 28 2 * $HOME/bin/logmove