Rename the space

Rename the UserSpace itself to name. A UserSpace cannot be renamed if it is subsequently derived by its recursive parent’s inheritance.

When the UserSpace is renamed, all the values, including input values, of the recursive child Cells in the UserSpace are cleared and all the recursive child ItemSpaces are deleted.

If the UserSpace has subsequently derived sub spaces, these sub spaces are also renamed.

Added in version 0.16.0.