Support /-Y and COPYCMD env. variable by the "copy" builtin

[Alexander.Farber at nokia.com]

[Sorry! I've noticed there was line-wrapping,
 so I'm resending my patch as attachment]

Hello,

please kindly add my small patch for the builtin "copy" command.

Changelog: 
	cmd: Support /-Y and COPYCMD env. variable by the "copy" builtin

Regards
Alex

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