Allow the add command to add symbolic links
This resolves #399 (closed) by allowing a mode of 120000 in the add command so that symbolic links can be added.
It also reports an error when an unsupported mode is used in an add command.
This resolves #399 (closed) by allowing a mode of 120000 in the add command so that symbolic links can be added.
It also reports an error when an unsupported mode is used in an add command.