fix Supervisor call bug

-fix thread stack adjustment  before calling supervisor call from
exception
-fix source tree : lib folder deletion
Fix Scheduler Bug

- Deque operation of scheduler queue returns the pointer of its own. ->
queue operation check its status so ensure it’s not empty.
- result of dequeue operation should be null-checked
Merge pull request #4 from fritzprix/tachyos_ansi_clib

Tachyos ansi clib