Allow renaming a file within the project

[Wolfgang]

While it is possible to add, remove and replace files in a CVI project it is not possible to rename or duplicate a file.

This is useful for example if a large source code file shall be split to speed up compilation. Although this file operation could be done outside of CVI associated tags would be lost.

A workaround has been offered here but a more elegant and simple solution would be welcome. Hence I suggest to provide two more commands to add and duplicate a file including its associated tags and breakpoints...

Thanks.