- add timeout package to enable reads and writes with timeouts
- rework ToSystem
- autocheck for update when imported
- add ReadSeekCloser helper
- cleanup
- let ReadSeekCloser and ReadCloser helper return errors when reading/seeking after closing

- add tempfs
- add support for closing a fs after usage
- close fs after testing for readonly, ext_deleteable and ext_writeable tests
- import new spectest version with support for hooks

remove path.Dir function and replace it with the implementation of Relative.Dir, Remote.Dir and Local.Dir

- improve docs
- add tests