Verbose -- request verbose feedback

Functions with optional argument named Verbose :

• copyDirectory(..., Verbose => ...), see copyDirectory(String,String)
• copyFile(..., Verbose => ...), see copyFile(String,String)
• moveFile(..., Verbose => ...) -- missing documentation
• symlinkDirectory(..., Verbose => ...), see symlinkDirectory(String,String) -- make symbolic links for all files in a directory tree