v1.4.0

--- 1.4 ---
feature: Added option to clear final directory
feature: Added option to disable thumbnail creation
feature: Added standard error messages for RSYNC and SCP calls
feature: Added command arguments as drop done selection for RSYNC and SCP
feature: Now multi-threaded (when threads > 0)
issue: output from exec calls not handled properly
issue: Fix up db checks to correctly identify upgrades required
issue: Clear system cache before file checks
issue: Too many logs, alter logging level for some messages