Use `kwargs['path']` and do not shadow `path`

The `__call__` function defines a `path` parameter that was mistakenly
shadowed by the closure function that actually executes the call. Rename
temporary parameter `path` to `cwd` and properly set its value given that
`kwargs['path']` contains a value or set to `os.getcwd()`.
Read VERBOSE flag from fully qualified module

The value of `VERBOSE` is locally bound before the change to
`xnt.verbose.VERBOSE` occurs. Thus, reading the local `VERBOSE` value
does not have the desired effect. Read from the fully qualified module
variable.