MPI release 0.25.2

Various enhancements

• support group priorities

• less log at loglevel info

• repeated logfile lines are not suppressed

• log level can be toggled by signal.

• dump of server state into logfile can be triggered by signaö

• avoid compiler warnings, avoid valgrind warnings

• server status in database is more current

• less database stress and more jobs of a group on a single server

  844fd6c MXQ bump version
  b5fe300 Merge pull request #63 from donald/work
  f15abe0 mxqd: Use return() instead of exit()
  ed54cf5 mxqd: Refactor main loop
  adbe312 mxqdctl-hostconfig: Add debug commands
  3fe7c3d mxqd: Change some messages from info to debug
  0717a76 mxqd: Only process signals we expect
  117c12b mxqd: Change poll times
  82d7a31 mxqd: Start jobs without main loop iteration
  6a15b2b mxqd: Reduce logging at log level info in main loop
  447cc7f mxq_log: Do not deduplicate messages
  3a7b5f6 mxqd: Change loglevel on SIGUSR2 q=20 or 21
  8660ae5 mxqd: Dump server state on SIGUSR2 q=10
  e64d665 mxqd: Remove volatile sig_atomic_t type
  784dcbc mxqd: Remove reset_signals
  7219743 mxqd: Remove obsolete signal() calls in reaper
  ff2f49f mxqd: Use synchronous signals
  d99d562 mxqd: Sort groups by priority
  e10e3d0 mxqd_config: Add server_sort_groups_by_priority
  c956da7 mxqd_control: Use generic sort function to sort users
  8496f6a mx_util: Add mx_sort_linked_list
  24fe539 test_mx_util: Avoid -Wparentheses warnings