flect tree2 (tree2 is unchanged)
 Run with showOnly=1 and different values of flag to see its effect.

 By default showOnly==1. If showOnly, displays a list of actions that need
 to be performed in order to synchronize the two directory trees, but does
 not actually perform the actions. It is highly recommended to run
 dirSynch first with showOnly=1 before running it with showOnly=0.

 USAGE
  dirSynch( root1, root2, [showOnly], [flag], [ignDate] )

 INPUTS
  root1    - root directory of tree1
