3.9.4.15

• Replaced a problematic command execution function with a simpler and improved version
  • The previous version caused output of some commands to be partially missed due to complications with a threaded readout function - incl df and find, which in turn affected the looping job algorithm and lead to job failures at least at BNL during last weekend
• Internal improvements
  • Now handling empty output/file names from find command used by looping job algorithm
    • Harmless though, as it would anyway be filtered out later
• Bug fix
  • Added missing f in f-statement, which previously led to an uninformative log message for remaining disk space
  • Reported by R. Walker