Changed ptime_t in ptime and tspec_t into tspec
Tests now working. Wait_flag eliminated.
Solved some bugs with the activation flag. Now it should be working.
One single task create function called __create_internal(). Now it is easier to make modification to the
creation process.
Added a test for the wait_for_instance, both for periodic and
aperiodic tasks.
Removed the wait_for_period, now it is an internal static functions,
will be removed later for optimization.
Changed the name of task_create() into ptask_create().
Same for ptask_create_ex()
Removed the wcet related functions. Now, to measure wcet, use module tstat.h
A little bug.
Added the new version to the README.