Improved handling of the null device
Modified s:last_status value

- fixed type of s:last_status
- set '-1' when exception occurred
Merge pull request #153 from ichizok/null-device

Improve handling of the null device
Merge pull request #154 from ichizok/modify-last_status

Modified s:last_status value
[WIP] Improved read performance
[WIP] Improved R/W

- handling (pseudo-)binary directly
[WIP] Improved proc_w32
[WIP] adjust read timeout
[WIP] fixed s:read process
[WIP] Improved s:read_line(s)