Synchronize to source file directories by merging newest code
 
 Useage: 
 
 sh_sync [source_dir] [target_dir] -m [module] -auto -full
 
 where [source_dir] is the primary source directory
       [target_dir] is the target directory
 
 Optional arguments:
       [module] is a specific module to be updated (e.g. globk)
       -auto will automatically update the directories.  The default
             is to create the list of copies for the user to review
       -full will diff the files to be copied to see if the update
             is really necessary
 
 Script must be run from a directory where you have write permission